diff --git a/Modules/Compiler/Clang-C.cmake b/Modules/Compiler/Clang-C.cmake
index 8f00a72e3d..dc186072b3 100644
--- a/Modules/Compiler/Clang-C.cmake
+++ b/Modules/Compiler/Clang-C.cmake
@@ -25,7 +25,7 @@ elseif("x${CMAKE_C_COMPILER_FRONTEND_VARIANT}" STREQUAL "xGNU")
   endif()
 endif()
 
-if(NOT "x${CMAKE_C_SIMULATE_ID}" STREQUAL "xMSVC")
+if("x${CMAKE_C_COMPILER_FRONTEND_VARIANT}" STREQUAL "xGNU")
   if(CMAKE_C_COMPILER_VERSION VERSION_GREATER_EQUAL 2.1)
     set(CMAKE_C90_STANDARD_COMPILE_OPTION "-std=c90")
     set(CMAKE_C90_EXTENSION_COMPILE_OPTION "-std=gnu90")