diff --git a/IGC/CMakeLists.txt b/IGC/CMakeLists.txt
index 811c6f575..e082b6ed1 100644
--- a/IGC/CMakeLists.txt
+++ b/IGC/CMakeLists.txt
@@ -970,6 +970,7 @@ foreach(_compilerFlagName IN ITEMS "CMAKE_CXX_FLAGS" "CMAKE_C_FLAGS")
         "${_compilerFlagName}"
         PATTERN "${IGC_BUILD__RELEASE_PATTERN}"
         SET_RAW
+          -U_FORTIFY_SOURCE
           -D_FORTIFY_SOURCE=2
           -fstack-protector
     )