diff --git a/clang/include/clang/AST/Type.h b/clang/include/clang/AST/Type.h
--- a/clang/include/clang/AST/Type.h
+++ b/clang/include/clang/AST/Type.h
@@ -1649,7 +1649,7 @@
     unsigned : NumTypeBits;
 
     /// The kind (BuiltinType::Kind) of builtin type this is.
-    static constexpr unsigned NumOfBuiltinTypeBits = 8;
+    static constexpr unsigned NumOfBuiltinTypeBits = 9;
     unsigned Kind : NumOfBuiltinTypeBits;
   };