diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8603c6a..9f3aff8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -57,10 +57,7 @@ add_library(BlocksRuntime
   src/BlocksRuntime/runtime.c)
 
 if(WIN32)
-  target_sources(BlocksRuntime PRIVATE
-    BlocksRuntime.def)
-
-  if(NOT BUILD_SHARED_LIBS)
+  if (NOT BUILD_SHARED_LIBS)
     target_compile_definitions(BlocksRuntime PUBLIC BlocksRuntime_STATIC)
     target_compile_options(BlocksRuntime PUBLIC
       "$<$<COMPILE_LANGUAGE:C,CXX>:SHELL:$<$<BOOL:${MSVC}>:-Xclang >-static-libclosure>"
diff --git a/src/BlocksRuntime/Block.h b/src/BlocksRuntime/Block.h
index 32f27f4..d24bbdc 100644
--- a/src/BlocksRuntime/Block.h
+++ b/src/BlocksRuntime/Block.h
@@ -52,13 +52,8 @@ BLOCK_EXPORT void _Block_object_assign(void *, const void *, const int);
 BLOCK_EXPORT void _Block_object_dispose(const void *, const int);
 
 // Used by the compiler. Do not use these variables yourself.
-#if defined(_WIN32)
-extern void * _NSConcreteGlobalBlock[32];
-extern void * _NSConcreteStackBlock[32];
-#else
 BLOCK_EXPORT void * _NSConcreteGlobalBlock[32];
 BLOCK_EXPORT void * _NSConcreteStackBlock[32];
-#endif
 
 #if __cplusplus
 }
diff --git a/src/BlocksRuntime/BlocksRuntime.def b/src/BlocksRuntime/BlocksRuntime.def
deleted file mode 100644
index a3b1aab..0000000
--- a/src/BlocksRuntime/BlocksRuntime.def
+++ /dev/null
@@ -1,4 +0,0 @@
-LIBRARY BlocksRuntime
-EXPORTS
-  _NSConcreteGlobalBlock CONSTANT
-  _NSConcreteStackBlock CONSTANT
diff --git a/src/BlocksRuntime/CMakeLists.txt b/src/BlocksRuntime/CMakeLists.txt
deleted file mode 100644
index 2301ffe..0000000
--- a/src/BlocksRuntime/CMakeLists.txt
+++ /dev/null
@@ -1,43 +0,0 @@
-
-add_library(BlocksRuntime
-  data.c
-  runtime.c)
-if(WIN32)
-  target_sources(BlocksRuntime PRIVATE
-    BlocksRuntime.def)
-
-  if(NOT BUILD_SHARED_LIBS)
-    target_compile_definitions(BlocksRuntime PUBLIC
-      BlocksRuntime_STATIC)
-    target_compile_options(BlocksRuntime PUBLIC
-      "$<$<COMPILE_LANGUAGE:C,CXX>:SHELL:$<$<BOOL:${MSVC}>:-Xclang >-static-libclosure>"
-      $<$<COMPILE_LANGUAGE:Swift>:SHELL:-Xcc -static-libclosure>)
-  endif()
-endif()
-
-target_include_directories(BlocksRuntime PUBLIC
-  ${CMAKE_CURRENT_SOURCE_DIR})
-if(HAVE_OBJC AND CMAKE_DL_LIBS)
-  target_link_libraries(BlocksRuntime PUBLIC
-    ${CMAKE_DL_LIBS})
-endif()
-
-export(TARGETS BlocksRuntime
-       FILE cmake/export/BlocksRuntime.cmake)
-
-if(LINKER_SUPPORTS_BUILD_ID)
-  target_link_options(BlocksRuntime PRIVATE "LINKER:--build-id=sha1")
-endif()
-
-add_library(BlocksRuntime::BlocksRuntime ALIAS BlocksRuntime)
-
-install(FILES Block.h
-        DESTINATION ${INSTALL_BLOCK_HEADERS_DIR})
-install(FILES Block_private.h
-        DESTINATION ${INSTALL_BLOCK_HEADERS_DIR}/BlocksRuntime)
-set_property(GLOBAL APPEND PROPERTY DISPATCH_EXPORTS BlocksRuntime)
-install(TARGETS BlocksRuntime
-        EXPORT BlocksRuntime
-        ARCHIVE DESTINATION ${INSTALL_TARGET_DIR}
-        LIBRARY DESTINATION ${INSTALL_TARGET_DIR}
-        RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR})