diff --git a/sdk/tools/widl/CMakeLists.txt b/sdk/tools/widl/CMakeLists.txt
index 0a4533f03b0..4c0818489d0 100644
--- a/sdk/tools/widl/CMakeLists.txt
+++ b/sdk/tools/widl/CMakeLists.txt
@@ -48,4 +48,6 @@ if(MSVC)
 
     # Disable warning "'=': conversion from 'a' to 'b', possible loss of data"
     target_compile_options(widl PRIVATE "/wd4244")
+
+    target_compile_options(widl PRIVATE "-WX")
 endif()