diff --git a/dtool/CompilerFlags.cmake b/dtool/CompilerFlags.cmake
index 0b6945878e..e3820ae652 100644
--- a/dtool/CompilerFlags.cmake
+++ b/dtool/CompilerFlags.cmake
@@ -101,7 +101,7 @@ endif()
 # Set warning levels
 if(MSVC)
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} /W3")
-  set(CMAKE_CCXX_FLAGS "${CMAKE_CXX_FLAGS} /W3")
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /W3")
 
 else()
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall")