diff --git a/src/cec-client/CMakeLists.txt b/src/cec-client/CMakeLists.txt
index ad28f961..8c72bd4a 100644
--- a/src/cec-client/CMakeLists.txt
+++ b/src/cec-client/CMakeLists.txt
@@ -66,7 +66,9 @@ if (NOT WIN32)
   endif()
 else()
   add_definitions(-DTARGET_WINDOWS -DNOMINMAX -D_CRT_SECURE_NO_WARNINGS -D_WINSOCKAPI_)
-  if ((${WIN64}) OR (${_M_ARM64}))
+  check_symbol_exists(_AMD64_ Windows.h WIN64)
+  check_symbol_exists(_ARM64_ Windows.h ARM64)
+  if (WIN64 OR ARM64)
     string(REPLACE "/arch:SSE2" "" CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})
   else()
     add_definitions(-D_USE_32BIT_TIME_T)
diff --git a/src/cecc-client/CMakeLists.txt b/src/cecc-client/CMakeLists.txt
index 6f36d6df..f73c992d 100644
--- a/src/cecc-client/CMakeLists.txt
+++ b/src/cecc-client/CMakeLists.txt
@@ -36,7 +36,9 @@ if (NOT WIN32)
   endif()
 else()
   add_definitions(-DTARGET_WINDOWS -DNOMINMAX -D_CRT_SECURE_NO_WARNINGS -D_WINSOCKAPI_)
-  if ((${WIN64}) OR (${_M_ARM64}))
+  check_symbol_exists(_AMD64_ Windows.h WIN64)
+  check_symbol_exists(_ARM64_ Windows.h ARM64)
+  if (WIN64 OR ARM64)
     string(REPLACE "/arch:SSE2" "" CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})
   else()
     add_definitions(-D_USE_32BIT_TIME_T)
diff --git a/src/libcec/CMakeLists.txt b/src/libcec/CMakeLists.txt
index e1d8dcb5..f8f3dd02 100644
--- a/src/libcec/CMakeLists.txt
+++ b/src/libcec/CMakeLists.txt
@@ -161,7 +161,7 @@ if (WIN32)
   configure_file(${CMAKE_CURRENT_SOURCE_DIR}/libcec.rc.in ${CMAKE_CURRENT_SOURCE_DIR}/libcec.rc)
   add_definitions(-DDLL_EXPORT)
   add_definitions(-DTARGET_WINDOWS -DNOMINMAX -D_CRT_SECURE_NO_WARNINGS -D_WINSOCKAPI_)
-  if ((${WIN64}) OR (${_M_ARM64}))
+  if (WIN64 OR ARM64)
     string(REPLACE "/arch:SSE2" "" CMAKE_CXX_FLAGS ${CMAKE_CXX_FLAGS})
   else()
     add_definitions(-D_USE_32BIT_TIME_T)
diff --git a/src/libcec/cmake/CheckPlatformSupport.cmake b/src/libcec/cmake/CheckPlatformSupport.cmake
index 62412c51..24f3765d 100644
--- a/src/libcec/cmake/CheckPlatformSupport.cmake
+++ b/src/libcec/cmake/CheckPlatformSupport.cmake
@@ -50,14 +50,14 @@ if(WIN32)
     # force python2 for eventghost
     set(PYTHON_USE_VERSION 2)
   elseif("${MSVC_C_ARCHITECTURE_ID}" STREQUAL "x64")
-    check_symbol_exists(_X64_ Windows.h WIN64)
-    check_symbol_exists(_AMD64_ Windows.h AMD64)
-    if (DEFINED WIN64 OR DEFINED AMD64)
+    check_symbol_exists(_AMD64_ Windows.h WIN64)
+    if (DEFINED WIN64)
       set(LIB_INFO "${LIB_INFO} (x64)")
     endif()
   elseif("${MSVC_C_ARCHITECTURE_ID}" STREQUAL "ARM")
     set(LIB_INFO "${LIB_INFO} (arm)")
   elseif("${MSVC_C_ARCHITECTURE_ID}" STREQUAL "ARM64")
+    check_symbol_exists(_ARM64_ Windows.h ARM64)
     set(LIB_INFO "${LIB_INFO} (arm64)")    
   else()
     message(FATAL_ERROR "Unknown architecture id: ${MSVC_C_ARCHITECTURE_ID}")