diff --git a/include/llvm/System/Atomic.h b/include/llvm/System/Atomic.h
index eeb4fe26da1..f6cac962e79 100644
--- a/include/llvm/System/Atomic.h
+++ b/include/llvm/System/Atomic.h
@@ -14,7 +14,7 @@
 #ifndef LLVM_SYSTEM_ATOMIC_H
 #define LLVM_SYSTEM_ATOMIC_H
 
-#include <stdint.h>
+#include "llvm/Support/DataTypes.h"
 
 namespace llvm {
   namespace sys {