diff --git a/AST/Expr.cpp b/AST/Expr.cpp
index f323dff..910bdf9 100644
--- a/AST/Expr.cpp
+++ b/AST/Expr.cpp
@@ -365,6 +365,7 @@
   case ParenExprClass:
     return cast<ParenExpr>(this)->getSubExpr()->isConstantExpr(Ctx, Loc);
   case StringLiteralClass:
+  case ObjCStringLiteralClass:
   case FloatingLiteralClass:
   case IntegerLiteralClass:
   case CharacterLiteralClass: