diff --git a/source/uWVConstants.pas b/source/uWVConstants.pas
index 3d7651c..94f8aaa 100644
--- a/source/uWVConstants.pas
+++ b/source/uWVConstants.pas
@@ -83,9 +83,9 @@ interface
 
   WEBVIEW4DELPHI_INVALID_FRAMEID = 0;
 
-{$IFDEF FPC}
+  {$IF NOT DECLARED(HWND_MESSAGE)}
   HWND_MESSAGE = System.THandle(-3);
-{$ENDIF}
+  {$IFEND}
 
 implementation
 
diff --git a/update_WebView4Delphi.json b/update_WebView4Delphi.json
index 0e239bd..eda1217 100644
--- a/update_WebView4Delphi.json
+++ b/update_WebView4Delphi.json
@@ -2,7 +2,7 @@
   "UpdateLazPackages" : [
     {
       "ForceNotify" : true,
-      "InternalVersion" : 134,
+      "InternalVersion" : 135,
       "Name" : "webview4delphi.lpk",
       "Version" : "1.0.2277.86"
     }