diff --git a/llvm/include/llvm/Demangle/ItaniumDemangle.h b/llvm/include/llvm/Demangle/ItaniumDemangle.h
index b4a4c72021fd1..f37905971a833 100644
--- a/llvm/include/llvm/Demangle/ItaniumDemangle.h
+++ b/llvm/include/llvm/Demangle/ItaniumDemangle.h
@@ -610,6 +610,8 @@ class EnableIfAttr : public Node {
   }
 };
 
+class PointerType;
+
 class ObjCProtoName : public Node {
   const Node *Ty;
   std::string_view Protocol;