diff --git a/.github/workflows/python_packages.yml b/.github/workflows/python_packages.yml
index 7bdbb20e..ade22051 100644
--- a/.github/workflows/python_packages.yml
+++ b/.github/workflows/python_packages.yml
@@ -56,8 +56,8 @@ jobs:
           name: dist-musllinux_x86_64
 
   build_windows_wheels:
-    name: Build wheels on windows-latest
-    runs-on: windows-2022
+    name: Build wheels on Windows
+    runs-on: windows-2025
     env:
       CMAKE_GENERATOR: "Visual Studio 17 2022"
       SQLite3_ROOT: "C:/vcpkg/installed/x64-windows"
@@ -89,8 +89,8 @@ jobs:
           name: dist-windows
 
   build_windows_32_wheels:
-    name: Build 32bit wheels on windows-latest
-    runs-on: windows-2022
+    name: Build 32bit wheels on Windows
+    runs-on: windows-2025
     env:
       CMAKE_GENERATOR: "Visual Studio 17 2022"
       CMAKE_GENERATOR_PLATFORM: "Win32"
diff --git a/.github/workflows/win_cli_build.yml b/.github/workflows/win_cli_build.yml
new file mode 100644
index 00000000..d9946f70
--- /dev/null
+++ b/.github/workflows/win_cli_build.yml
@@ -0,0 +1,31 @@
+name: Windows geodiff.exe build
+on: [push, pull_request]
+
+jobs:
+  win_cli_build:
+    runs-on: windows-2025
+    steps:
+      - name: Checkout Geodiff
+        uses: actions/checkout@v3
+
+      - name: Build Geodiff
+        shell: pwsh
+        run: |
+          # Github runners have two installations of vcpkg, one from Visual
+          # Studio and one extra. Use the second one explicitly to avoid mixups.
+          $env:VCPKG_ROOT = "C:\vcpkg"
+          & $env:VCPKG_ROOT/vcpkg install --triplet x64-windows-static sqlite3
+          & $env:VCPKG_ROOT/vcpkg install --triplet x64-windows-static libpq[openssl]
+          cd $env:GITHUB_WORKSPACE/geodiff
+          mkdir build
+          cd build
+          cmake .. -DCMAKE_TOOLCHAIN_FILE="$env:VCPKG_ROOT/scripts/buildsystems/vcpkg.cmake" -DWITH_POSTGRESQL=TRUE -DVCPKG_TARGET_TRIPLET=x64-windows-static
+          cmake --build . --config Release
+          echo "geodiff_exe=$(pwd)/Release/geodiff.exe" >> $env:GITHUB_ENV
+
+      - name: Upload geodiff.exe artifact
+        uses: actions/upload-artifact@v6
+        with:
+          name: geodiff.exe
+          path: ${{ env.geodiff_exe }}
+          if-no-files-found: error
diff --git a/.github/workflows/win_tests.yml b/.github/workflows/win_tests.yml
index ea0f8750..f7587a64 100644
--- a/.github/workflows/win_tests.yml
+++ b/.github/workflows/win_tests.yml
@@ -4,11 +4,11 @@ on: [push, pull_request]
 concurrency:
   group: ci-${{github.ref}}-win-tests
   cancel-in-progress: true
-  
+
 jobs:
   build_win_test:
     if: github.repository == 'MerginMaps/geodiff'
-    runs-on: windows-latest
+    runs-on: windows-2025
     steps:
       - name: Checkout Geodiff
         uses: actions/checkout@v3
@@ -18,12 +18,12 @@ jobs:
           C:/vcpkg/vcpkg install sqlite3[rtree,fts3,json1] --triplet x64-windows
           C:/vcpkg/vcpkg integrate install
           dir "C:/vcpkg/installed/x64-windows/bin"
-      
+
       - name: set compiler environment
         shell: cmd
         run: |
             CALL "C:\Program Files\Microsoft Visual Studio\2022\Enterprise\Common7\Tools\VsDevCmd.bat" -arch=x86
-    
+
       - name: build geodiff
         shell: pwsh
         run: |
diff --git a/geodiff/CMakeLists.txt b/geodiff/CMakeLists.txt
index 3bbd418b..f59f081d 100644
--- a/geodiff/CMakeLists.txt
+++ b/geodiff/CMakeLists.txt
@@ -118,8 +118,8 @@ INCLUDE_DIRECTORIES(
   ${CMAKE_CURRENT_SOURCE_DIR}/src/3rdparty
   ${CMAKE_CURRENT_SOURCE_DIR}/src/drivers
   ${CMAKE_CURRENT_BINARY_DIR}
-  ${SQLite3_INCLUDE_DIRS}
 )
+LINK_LIBRARIES(SQLite::SQLite3)
 
 # create geodiff_config.h
 CONFIGURE_FILE(${CMAKE_SOURCE_DIR}/cmake_templates/geodiff_config.hpp.in ${CMAKE_BINARY_DIR}/geodiff_config.hpp)
@@ -187,7 +187,7 @@ IF ( BUILD_STATIC )
   TARGET_COMPILE_DEFINITIONS(${GEODIFF_NAME}_a PUBLIC -DGEODIFF_STATIC)
   TARGET_INCLUDE_DIRECTORIES(${GEODIFF_NAME}_a PRIVATE ${libgpkg_dir}/gpkg)
   IF (POSTGRES_FOUND)
-    TARGET_INCLUDE_DIRECTORIES(${GEODIFF_NAME}_a PRIVATE ${POSTGRES_INCLUDE_DIR})
+    TARGET_LINK_LIBRARIES(${GEODIFF_NAME}_a PRIVATE Postgres::Postgres)
   ENDIF ()
 
   # win32 libs
@@ -207,12 +207,10 @@ IF ( BUILD_SHARED )
         TARGET_LINK_LIBRARIES(${GEODIFF_NAME} PUBLIC dl pthread)
     ENDIF (NOT WIN32 AND NOT ANDROID AND NOT IOS)
 
-    TARGET_LINK_LIBRARIES(${GEODIFF_NAME} PUBLIC ${SQLite3_LIBRARIES})
     TARGET_INCLUDE_DIRECTORIES(${GEODIFF_NAME} PRIVATE ${libgpkg_dir}/gpkg)
 
     IF (POSTGRES_FOUND)
-      TARGET_INCLUDE_DIRECTORIES(${GEODIFF_NAME} PRIVATE ${POSTGRES_INCLUDE_DIR})
-      TARGET_LINK_LIBRARIES(${GEODIFF_NAME} PUBLIC ${POSTGRES_LIBRARY})
+      TARGET_LINK_LIBRARIES(${GEODIFF_NAME} PUBLIC Postgres::Postgres)
     ENDIF ()
 
     # win32 libs
@@ -228,9 +226,8 @@ IF (BUILD_TOOLS)
     ADD_EXECUTABLE(geodiff-cli ${geodiff_cli_src})
     TARGET_LINK_LIBRARIES(geodiff-cli PUBLIC ${GEODIFF_NAME}_a )
     SET_TARGET_PROPERTIES(geodiff-cli PROPERTIES OUTPUT_NAME geodiff)
-    TARGET_LINK_LIBRARIES(geodiff-cli PUBLIC ${SQLite3_LIBRARIES} )
     IF (POSTGRES_FOUND)
-        TARGET_LINK_LIBRARIES(geodiff-cli PUBLIC ${POSTGRES_LIBRARY})
+        TARGET_LINK_LIBRARIES(geodiff-cli PUBLIC Postgres::Postgres)
     ENDIF ()
 ENDIF (BUILD_TOOLS)
 
diff --git a/geodiff/cmake/FindPostgres.cmake b/geodiff/cmake/FindPostgres.cmake
index c1b84db5..55579550 100644
--- a/geodiff/cmake/FindPostgres.cmake
+++ b/geodiff/cmake/FindPostgres.cmake
@@ -9,126 +9,141 @@
 # pg_config is searched for in POSTGRES_CONFIG dir,
 # default /usr/bin
 #
-# If it's found it sets POSTGRES_FOUND to TRUE
+# If it's found it sets POSTGRES_FOUND to TRUE,
+# a library named Postgres::Postgres is created
 # and following variables are set:
 #    POSTGRES_INCLUDE_DIR
 #    POSTGRES_LIBRARY
 
-IF(ANDROID)
-  SET(POSTGRES_INCLUDE_DIR ${POSTGRES_INCLUDE_DIR} CACHE STRING INTERNAL)
-  SET(POSTGRES_LIBRARY ${PG_TMP}/libpq.so CACHE STRING INTERNAL)
-ENDIF(ANDROID)
-
-IF(WIN32 AND NOT ANDROID)
-  IF (NOT POSTGRES_INCLUDE_DIR)
-    FIND_PATH(POSTGRES_INCLUDE_DIR libpq-fe.h
-      /usr/local/include
-      /usr/include
-      c:/msys/local/include
-      "$ENV{LIB_DIR}/include/postgresql"
-      "$ENV{LIB_DIR}/include"
-      )
-  ENDIF (NOT POSTGRES_INCLUDE_DIR)
-
-  IF (NOT POSTGRES_LIBRARY)
-    FIND_LIBRARY(POSTGRES_LIBRARY NAMES pq libpq libpqdll PATHS
-      /usr/local/lib
-      /usr/lib
-      c:/msys/local/lib
-      "$ENV{LIB_DIR}/lib"
-      )
-  ENDIF (NOT POSTGRES_LIBRARY)
-
-ELSE(WIN32)
-  IF(UNIX)
-
-    SET(POSTGRES_CONFIG_PREFER_PATH "$ENV{POSTGRES_HOME}/bin" CACHE STRING "preferred path to PG (pg_config)")
-    FIND_PROGRAM(POSTGRES_CONFIG pg_config
-      ${POSTGRES_CONFIG_PREFER_PATH}
-      /usr/local/pgsql/bin/
-      /usr/local/bin/
-      /usr/bin/
-      )
-    # MESSAGE("DBG POSTGRES_CONFIG ${POSTGRES_CONFIG}")
-
-    IF (POSTGRES_CONFIG)
-      # set INCLUDE_DIR
-      EXEC_PROGRAM(${POSTGRES_CONFIG}
-        ARGS --includedir
-        OUTPUT_VARIABLE PG_TMP)
-      SET(POSTGRES_INCLUDE_DIR ${PG_TMP} CACHE STRING INTERNAL)
-
-      # set LIBRARY_DIR
-      EXEC_PROGRAM(${POSTGRES_CONFIG}
-        ARGS --libdir
-        OUTPUT_VARIABLE PG_TMP)
-      IF (APPLE)
-        SET(POSTGRES_LIBRARY ${PG_TMP}/libpq.dylib CACHE STRING INTERNAL)
-      ELSEIF (CYGWIN)
-        EXEC_PROGRAM(${POSTGRES_CONFIG}
-        ARGS --libs
-        OUTPUT_VARIABLE PG_TMP)
-
-        STRING(REGEX MATCHALL "[-][L]([^ ;])+" _LDIRS "${PG_TMP}")
-        STRING(REGEX MATCHALL "[-][l]([^ ;])+" _LLIBS "${PG_TMP}")
-
-        FIND_LIBRARY(POSTGRES_LIBRARY NAMES pq PATHS /usr/lib /usr/local/lib)
-
-        SET(_DIRS)
-        FOREACH(_DIR ${_LDIRS})
-          STRING(REPLACE "-L" "" _DIR ${_DIR})
-          SET(_DIRS ${_DIRS} ${_DIR})
-        ENDFOREACH(_DIR ${_LDIRS})
-
-        SET(_LIBS)
-        FOREACH(_LIB ${_LLIBS})
-          STRING(REPLACE "-l" "" _LIB ${_LIB})
-          SET(_LIBS ${_LIBS} ${_LIB})
-        ENDFOREACH(_LIB ${_LDIRS})
-
-        FOREACH(_LIBNAME ${_LIBS})
-          UNSET(PG_LIB CACHE)
-          FIND_LIBRARY(PG_LIB NAMES ${_LIBNAME} PATHS ${_DIRS} /usr/lib /usr/local/lib)
-          IF(NOT PG_LIB)
-            MESSAGE(FATAL "PostgreSQL dependency library ${_LIBNAME} not found")
-          ENDIF(NOT PG_LIB)
-          SET(POSTGRES_LIBRARY ${POSTGRES_LIBRARY} ${PG_LIB})
-        ENDFOREACH(_LIBNAME ${_LIBS})
-
-      ELSE (CYGWIN)
-        FIND_LIBRARY(POSTGRES_LIBRARY NAMES pq libpq libpqdll PATHS ${PG_TMP})
-      ENDIF (APPLE)
-    ENDIF(POSTGRES_CONFIG)
-
-  ENDIF(UNIX)
-ENDIF(WIN32 AND NOT ANDROID)
-
-
-IF (POSTGRES_INCLUDE_DIR AND POSTGRES_LIBRARY)
-   SET(POSTGRES_FOUND TRUE)
-   IF(EXISTS "${POSTGRES_INCLUDE_DIR}/pg_config.h")
-     SET(HAVE_PGCONFIG TRUE)
-   ELSE(EXISTS "${POSTGRES_INCLUDE_DIR}/pg_config.h")
-     SET(HAVE_PGCONFIG FALSE)
-   ENDIF(EXISTS "${POSTGRES_INCLUDE_DIR}/pg_config.h")
-ENDIF (POSTGRES_INCLUDE_DIR AND POSTGRES_LIBRARY)
-
-
-IF (POSTGRES_FOUND)
-
-   IF (NOT POSTGRES_FIND_QUIETLY)
+# Try using vcpkg-provided package
+FIND_PACKAGE(PostgreSQL)
+IF(PostgreSQL_FOUND)
+
+  SET(POSTGRES_FOUND TRUE)
+  ADD_LIBRARY(Postgres::Postgres ALIAS PostgreSQL::PostgreSQL)
+  GET_TARGET_PROPERTY(POSTGRES_INCLUDE_DIR
+    PostgreSQL::PostgreSQL INTERFACE_INCLUDE_DIRECTORIES)
+  GET_TARGET_PROPERTY(POSTGRES_LIBRARY
+    PostgreSQL::PostgreSQL LOCATION)
+
+# or look for libpq ourselves
+ELSE(PostgreSQL_FOUND)
+
+  IF(ANDROID)
+    SET(POSTGRES_INCLUDE_DIR ${POSTGRES_INCLUDE_DIR} CACHE STRING INTERNAL)
+    SET(POSTGRES_LIBRARY ${PG_TMP}/libpq.so CACHE STRING INTERNAL)
+  ENDIF(ANDROID)
+
+  IF(WIN32 AND NOT ANDROID)
+    IF(NOT POSTGRES_INCLUDE_DIR)
+      FIND_PATH(POSTGRES_INCLUDE_DIR libpq-fe.h
+        /usr/local/include
+        /usr/include
+        c:/msys/local/include
+        "$ENV{LIB_DIR}/include/postgresql"
+        "$ENV{LIB_DIR}/include"
+        )
+    ENDIF(NOT POSTGRES_INCLUDE_DIR)
+
+    IF(NOT POSTGRES_LIBRARY)
+      FIND_LIBRARY(POSTGRES_LIBRARY NAMES pq libpq libpqdll PATHS
+        /usr/local/lib
+        /usr/lib
+        c:/msys/local/lib
+        "$ENV{LIB_DIR}/lib"
+        )
+    ENDIF(NOT POSTGRES_LIBRARY)
+
+  ELSE(WIN32)
+    IF(UNIX)
+
+      SET(POSTGRES_CONFIG_PREFER_PATH "$ENV{POSTGRES_HOME}/bin" CACHE STRING "preferred path to PG (pg_config)")
+      FIND_PROGRAM(POSTGRES_CONFIG pg_config
+        ${POSTGRES_CONFIG_PREFER_PATH}
+        /usr/local/pgsql/bin/
+        /usr/local/bin/
+        /usr/bin/
+        )
+      # MESSAGE("DBG POSTGRES_CONFIG ${POSTGRES_CONFIG}")
+
+      IF(POSTGRES_CONFIG)
+        # set INCLUDE_DIR
+        EXECUTE_PROCESS(COMMAND ${POSTGRES_CONFIG} --includedir
+          OUTPUT_VARIABLE PG_TMP
+          OUTPUT_STRIP_TRAILING_WHITESPACE)
+        SET(POSTGRES_INCLUDE_DIR ${PG_TMP} CACHE STRING INTERNAL)
+
+        # set LIBRARY_DIR
+        EXECUTE_PROCESS(COMMAND ${POSTGRES_CONFIG} --libdir
+          OUTPUT_VARIABLE PG_TMP
+          OUTPUT_STRIP_TRAILING_WHITESPACE)
+        IF(APPLE)
+          SET(POSTGRES_LIBRARY ${PG_TMP}/libpq.dylib CACHE STRING INTERNAL)
+        ELSEIF(CYGWIN)
+          EXECUTE_PROCESS(COMMAND ${POSTGRES_CONFIG} --libs
+            OUTPUT_VARIABLE PG_TMP
+            OUTPUT_STRIP_TRAILING_WHITESPACE)
+
+          STRING(REGEX MATCHALL "[-][L]([^ ;])+" _LDIRS "${PG_TMP}")
+          STRING(REGEX MATCHALL "[-][l]([^ ;])+" _LLIBS "${PG_TMP}")
+
+          FIND_LIBRARY(POSTGRES_LIBRARY NAMES pq PATHS /usr/lib /usr/local/lib)
+
+          SET(_DIRS)
+          FOREACH(_DIR ${_LDIRS})
+            STRING(REPLACE "-L" "" _DIR ${_DIR})
+            SET(_DIRS ${_DIRS} ${_DIR})
+          ENDFOREACH(_DIR ${_LDIRS})
+
+          SET(_LIBS)
+          FOREACH(_LIB ${_LLIBS})
+            STRING(REPLACE "-l" "" _LIB ${_LIB})
+            SET(_LIBS ${_LIBS} ${_LIB})
+          ENDFOREACH(_LIB ${_LDIRS})
+
+          FOREACH(_LIBNAME ${_LIBS})
+            UNSET(PG_LIB CACHE)
+            FIND_LIBRARY(PG_LIB NAMES ${_LIBNAME} PATHS ${_DIRS} /usr/lib /usr/local/lib)
+            IF(NOT PG_LIB)
+              MESSAGE(FATAL "PostgreSQL dependency library ${_LIBNAME} not found")
+            ENDIF(NOT PG_LIB)
+            SET(POSTGRES_LIBRARY ${POSTGRES_LIBRARY} ${PG_LIB})
+          ENDFOREACH(_LIBNAME ${_LIBS})
+
+        ELSE(CYGWIN)
+          FIND_LIBRARY(POSTGRES_LIBRARY NAMES pq libpq libpqdll PATHS ${PG_TMP})
+        ENDIF(APPLE)
+      ENDIF(POSTGRES_CONFIG)
+
+    ENDIF(UNIX)
+  ENDIF(WIN32 AND NOT ANDROID)
+
+
+  IF(POSTGRES_INCLUDE_DIR AND POSTGRES_LIBRARY)
+    SET(POSTGRES_FOUND TRUE)
+    IF(EXISTS "${POSTGRES_INCLUDE_DIR}/pg_config.h")
+      SET(HAVE_PGCONFIG TRUE)
+    ELSE(EXISTS "${POSTGRES_INCLUDE_DIR}/pg_config.h")
+      SET(HAVE_PGCONFIG FALSE)
+    ENDIF(EXISTS "${POSTGRES_INCLUDE_DIR}/pg_config.h")
+  ENDIF(POSTGRES_INCLUDE_DIR AND POSTGRES_LIBRARY)
+
+
+  IF(POSTGRES_FOUND)
+    IF(NOT POSTGRES_FIND_QUIETLY)
       MESSAGE(STATUS "Found PostgreSQL: ${POSTGRES_LIBRARY}")
-   ENDIF (NOT POSTGRES_FIND_QUIETLY)
-
-ELSE (POSTGRES_FOUND)
-
-   #SET (POSTGRES_INCLUDE_DIR "")
-   #SET (POSTGRES_LIBRARY "")
-
-   IF (POSTGRES_FIND_REQUIRED)
+    ENDIF(NOT POSTGRES_FIND_QUIETLY)
+
+    ADD_LIBRARY(Postgres::Postgres UNKNOWN IMPORTED)
+    SET_TARGET_PROPERTIES(Postgres::Postgres PROPERTIES
+      IMPORTED_LOCATION             "${POSTGRES_LIBRARY}"
+      INTERFACE_INCLUDE_DIRECTORIES "${POSTGRES_INCLUDE_DIR}")
+  ELSE(POSTGRES_FOUND)
+    IF(POSTGRES_FIND_REQUIRED)
       MESSAGE(FATAL_ERROR "Could not find PostgreSQL")
-   ELSE (POSTGRES_FIND_REQUIRED)
+    ELSE(POSTGRES_FIND_REQUIRED)
       MESSAGE(STATUS "Could not find PostgreSQL")
-   ENDIF (POSTGRES_FIND_REQUIRED)
+    ENDIF(POSTGRES_FIND_REQUIRED)
+  ENDIF(POSTGRES_FOUND)
 
-ENDIF (POSTGRES_FOUND)
+ENDIF(PostgreSQL_FOUND)
diff --git a/geodiff/src/drivers/postgresdriver.cpp b/geodiff/src/drivers/postgresdriver.cpp
index 775aed0d..38deef5a 100644
--- a/geodiff/src/drivers/postgresdriver.cpp
+++ b/geodiff/src/drivers/postgresdriver.cpp
@@ -488,7 +488,7 @@ static bool isColumnGeometry( const TableColumnInfo &col )
   return col.isGeometry;
 }
 
-static Value resultToValue( const PostgresResult &res, int r, size_t i, const TableColumnInfo &col )
+static Value resultToValue( const PostgresResult &res, int r, int i, const TableColumnInfo &col )
 {
   Value v;
   if ( res.isNull( r, i ) )
@@ -609,8 +609,8 @@ static void handleInserted( const std::string &schemaNameBase, const std::string
     ChangesetEntry e;
     e.op = reverse ? ChangesetEntry::OpDelete : ChangesetEntry::OpInsert;
 
-    size_t numColumns = tbl.columns.size();
-    for ( size_t i = 0; i < numColumns; ++i )
+    int numColumns = static_cast<int>( tbl.columns.size() );
+    for ( int i = 0; i < numColumns; ++i )
     {
       Value v( resultToValue( res, r, i, tbl.columns[i] ) );
       if ( reverse )
@@ -653,8 +653,8 @@ static void handleUpdated( const std::string &schemaNameBase, const std::string
     ChangesetEntry e;
     e.op = ChangesetEntry::OpUpdate;
 
-    size_t numColumns = tbl.columns.size();
-    for ( size_t i = 0; i < numColumns; ++i )
+    int numColumns = static_cast<int>( tbl.columns.size() );
+    for ( int i = 0; i < numColumns; ++i )
     {
       Value v1( resultToValue( res, r, i + numColumns, tbl.columns[i] ) );
       Value v2( resultToValue( res, r, i, tbl.columns[i] ) );
@@ -975,7 +975,7 @@ std::string PostgresDriver::getSequenceObjectName( const TableSchema &tbl, int &
 {
   std::string colName;
   autoIncrementPkeyIndex = -1;
-  for ( size_t i = 0; i < tbl.columns.size(); ++i )
+  for ( int i = 0; i < static_cast<int>( tbl.columns.size() ); ++i )
   {
     if ( tbl.columns[i].isPrimaryKey && tbl.columns[i].isAutoIncrement )
     {
@@ -1080,8 +1080,8 @@ void PostgresDriver::dumpData( ChangesetWriter &writer, bool useModified )
 
       ChangesetEntry e;
       e.op = ChangesetEntry::OpInsert;
-      size_t numColumns = tbl.columns.size();
-      for ( size_t i = 0; i < numColumns; ++i )
+      int numColumns = static_cast<int>( tbl.columns.size() );
+      for ( int i = 0; i < numColumns; ++i )
       {
         e.newValues.push_back( Value( resultToValue( res, r, i, tbl.columns[i] ) ) );
       }
diff --git a/geodiff/src/drivers/postgresutils.cpp b/geodiff/src/drivers/postgresutils.cpp
index 5b4f8d23..c1a8a180 100644
--- a/geodiff/src/drivers/postgresutils.cpp
+++ b/geodiff/src/drivers/postgresutils.cpp
@@ -14,16 +14,16 @@ GeoDiffPostgresException::GeoDiffPostgresException( PostgresResult res, const st
   : GeoDiffException( "postgres cmd error(" + res.sqlState() +
                       "): " + res.statusErrorMessage() +
                       ( sql.size() ? "\n\nSQL:\n" + sql : "" ) ),
-    mSql( sql ), mRes( std::move( res ) ) {}
+    mSql( sql ), mRes( new PostgresResult( std::move( res ) ) ) { }
 
 const PostgresResult &GeoDiffPostgresException::result() const
 {
-  return mRes;
+  return *mRes;
 }
 
 int GeoDiffPostgresException::errorCode() const
 {
-  if ( mRes.isIntegrityError() )
+  if ( result().isIntegrityError() )
     return GEODIFF_CONFLICTS;
   else
     return GEODIFF_ERROR;
diff --git a/geodiff/src/drivers/postgresutils.h b/geodiff/src/drivers/postgresutils.h
index 1df60b70..2d6d2b30 100644
--- a/geodiff/src/drivers/postgresutils.h
+++ b/geodiff/src/drivers/postgresutils.h
@@ -99,7 +99,9 @@ class GeoDiffPostgresException: public GeoDiffException
     int errorCode() const override;
   private:
     std::string mSql;
-    PostgresResult mRes;
+    // MSVC doesn't allow non-copyable exceptions, so we wrap non-copyable
+    // PostgresResult in a refcounting smart pointer.
+    std::shared_ptr<PostgresResult> mRes;
 };
 
 PostgresResult execSql( PGconn *c, const std::string &sql );