diff --git a/llvm/cmake/modules/CheckAtomic.cmake b/llvm/cmake/modules/CheckAtomic.cmake
index 6c4da66bfade..f40ff4dfbd31 100644
--- a/llvm/cmake/modules/CheckAtomic.cmake
+++ b/llvm/cmake/modules/CheckAtomic.cmake
@@ -2,11 +2,10 @@
 
 INCLUDE(CheckCXXSourceCompiles)
 
+CHECK_CXX_SOURCE_COMPILES("
 #ifdef _MSC_VER
 #include <windows.h>
 #endif
-	
-CHECK_CXX_SOURCE_COMPILES("
 int main() {
 #ifdef _MSC_VER
         volatile LONG val = 1;