diff --git a/clang/include/clang/AST/RawCommentList.h b/clang/include/clang/AST/RawCommentList.h
index 2f44a77d4503..53aae24fa7bb 100644
--- a/clang/include/clang/AST/RawCommentList.h
+++ b/clang/include/clang/AST/RawCommentList.h
@@ -178,6 +178,7 @@ class RawComment {
   mutable bool RawTextValid : 1;   ///< True if RawText is valid
   mutable bool BriefTextValid : 1; ///< True if BriefText is valid
 
+  LLVM_PREFERRED_TYPE(CommentKind)
   unsigned Kind : 3;
 
   /// True if comment is attached to a declaration in ASTContext.