diff --git a/CMake/PickyWarnings.cmake b/CMake/PickyWarnings.cmake
index 2785c7d24b..2ab9dc3517 100644
--- a/CMake/PickyWarnings.cmake
+++ b/CMake/PickyWarnings.cmake
@@ -52,9 +52,7 @@ if(CMAKE_C_COMPILER_ID STREQUAL "GNU" OR CMAKE_C_COMPILER_ID MATCHES "Clang")
 endif()
 
 if(MSVC)
-  # Use the highest warning level for Visual Studio.
-  string(REGEX REPLACE "[/-]W[0-4]" "" CMAKE_C_FLAGS "${CMAKE_C_FLAGS}")
-  list(APPEND _picky "-W4")
+  list(APPEND _picky "-W4")  # Use the highest warning level for Visual Studio.
 elseif(BORLAND)
   list(APPEND _picky "-w-")  # Disable warnings on Borland to avoid changing 3rd party code.
 endif()