diff --git a/cmake/modules/AddLLVM.cmake b/cmake/modules/AddLLVM.cmake
index f0b31ce6538..094969c8f4f 100644
--- a/cmake/modules/AddLLVM.cmake
+++ b/cmake/modules/AddLLVM.cmake
@@ -191,7 +191,7 @@ function(add_unittest test_suite test_name)
   if (LLVM_COMPILER_IS_GCC_COMPATIBLE)
     set(target_compile_flags "${target_compile_flags} -fno-rtti")
   elseif (MSVC)
-    set(target_compile_flags "${target_compile_flags} /GR-")
+    llvm_replace_compiler_option(target_compile_flags "/GR" "/GR-")
   endif ()
 
   if (SUPPORTS_NO_VARIADIC_MACROS_FLAG)