diff --git a/clang/include/clang/Basic/LangOptions.h b/clang/include/clang/Basic/LangOptions.h
index 49c4800d37f91..53ae2757d64e5 100644
--- a/clang/include/clang/Basic/LangOptions.h
+++ b/clang/include/clang/Basic/LangOptions.h
@@ -461,7 +461,7 @@ class LangOptionsBase {
   };
 
   /* TODO(BoundsSafety) Deprecate the flag  */
-  enum BoundsSafetyNewChecks {
+  enum BoundsSafetyNewChecks : uint8_t {
     BS_CHK_None = 0,
 
     BS_CHK_AccessSize = 1 << 0,          // rdar://72252593