diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 96567da..3d57903 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -122,6 +122,7 @@ foreach(CC_STANDARD ${CC_STANDARDS})
       set_target_properties(LanguageC${CC_STANDARD}Extensions${CC_EXTENSION}.test PROPERTIES C_STANDARD_REQUIRED TRUE)
       set_target_properties(LanguageC${CC_STANDARD}Extensions${CC_EXTENSION}.test PROPERTIES C_EXTENSIONS ${CC_EXTENSION})
       target_link_libraries(LanguageC${CC_STANDARD}Extensions${CC_EXTENSION}.test PRIVATE Khaos::Khaos KhaosTestFlags)
+      target_compile_options(LanguageC${CC_STANDARD}Extensions${CC_EXTENSION}.test PRIVATE $<$<C_COMPILER_ID:MSVC>:$<$<BOOL:NOT ${CC_EXTENSION}>:/Za>>)
       add_test(NAME "Test the language C${CC_STANDARD} extensions ${CC_EXTENSION}" COMMAND LanguageC${CC_STANDARD}Extensions${CC_EXTENSION}.test)
     endforeach()
   endif()