diff --git a/cmake/modules/LLVMProcessSources.cmake b/cmake/modules/LLVMProcessSources.cmake
index a71c6f2af83..e8a5a9431a2 100644
--- a/cmake/modules/LLVMProcessSources.cmake
+++ b/cmake/modules/LLVMProcessSources.cmake
@@ -46,6 +46,8 @@ function(llvm_process_sources OUT_VAR)
   if( NOT LLVM_REQUIRES_RTTI )
     if( CMAKE_COMPILER_IS_GNUCXX )
       add_definitions( -fno-rtti )
+    elseif( MSVC )
+      add_definitions( /GR- )
     endif()
   endif()