diff --git a/include/llvm/ADT/IntrusiveRefCntPtr.h b/include/llvm/ADT/IntrusiveRefCntPtr.h
index aa7ccdcf9c7..c46ce9a1598 100644
--- a/include/llvm/ADT/IntrusiveRefCntPtr.h
+++ b/include/llvm/ADT/IntrusiveRefCntPtr.h
@@ -99,7 +99,7 @@ namespace llvm {
 /// management of reference counts.
 template <class Derived>
 class ThreadSafeRefCountedBase {
-  mutable std::atomic_int RefCount;
+  mutable std::atomic<int> RefCount;
 
 protected:
   ThreadSafeRefCountedBase() : RefCount(0) {}