diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index fd3cfbc..1bfc1dc 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -36,15 +36,31 @@
 )
 
 if("${CMAKE_C_COMPILER_ID}" STREQUAL "GNU")
-  set_source_files_properties(test.c test.cpp PROPERTIES
+  set_source_files_properties(main.c test.c PROPERTIES
     COMPILE_FLAGS "-Wall -Wextra -Werror"
   )
 elseif("${CMAKE_C_COMPILER_ID}" STREQUAL "Clang")
-  set_source_files_properties(main.c test.c test.cpp PROPERTIES
+  set_source_files_properties(main.c test.c PROPERTIES
     COMPILE_FLAGS "-Wall -Wextra -Weverything -Werror"
   )
 elseif("${CMAKE_C_COMPILER_ID}" STREQUAL "MSVC")
-  set_source_files_properties(main.c test.c test.cpp PROPERTIES
+  set_source_files_properties(main.c test.c PROPERTIES
+    COMPILE_FLAGS "/Wall /WX /wd4514"
+  )
+else()
+  message(WARNING "Unknown compiler '${CMAKE_C_COMPILER_ID}'!")
+endif()
+
+if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
+  set_source_files_properties(test.cpp PROPERTIES
+    COMPILE_FLAGS "-Wall -Wextra -Werror"
+  )
+elseif("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
+  set_source_files_properties(test.cpp PROPERTIES
+    COMPILE_FLAGS "-Wall -Wextra -Weverything -Werror"
+  )
+elseif("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
+  set_source_files_properties(test.cpp PROPERTIES
     COMPILE_FLAGS "/Wall /WX /wd4514"
   )
 else()