--- mstools/samples/gdidemo/dialog.c	2018/08/09 18:20:01	1.1
+++ mstools/samples/gdidemo/dialog.c	2018/08/09 18:20:45	1.1.1.2
@@ -32,7 +32,7 @@ int FAR DisplayDialogBox(HWND hWnd, LPST
     {
         if(lpfDlg = MakeProcInstance(lpfFunction,hInstance))
         {
-            nRet = DialogBoxParam(hInstance,lpszTemplate,hWnd,lpfDlg,lExtra);
+	    nRet = DialogBoxParam(hInstance,lpszTemplate,hWnd,(DLGPROC)lpfDlg,lExtra);
             FreeProcInstance(lpfDlg);
         }
     }