diff --git a/clang/include/clang/Lex/MacroInfo.h b/clang/include/clang/Lex/MacroInfo.h
index 75c9ca70dfbbf..00c1c3866bbd9 100644
--- a/clang/include/clang/Lex/MacroInfo.h
+++ b/clang/include/clang/Lex/MacroInfo.h
@@ -206,7 +206,7 @@ class MacroInfo {
   void setIsGNUVarargs() { IsGNUVarargs = true; }
   bool isC99Varargs() const { return IsC99Varargs; }
   bool isGNUVarargs() const { return IsGNUVarargs; }
-  bool isVariadic() const { return IsC99Varargs | IsGNUVarargs; }
+  bool isVariadic() const { return IsC99Varargs || IsGNUVarargs; }
 
   /// Return true if this macro requires processing before expansion.
   ///