updated for version 7.2a
diff --git a/src/gui_xmdlg.c b/src/gui_xmdlg.c
index a747058..95e3268 100644
--- a/src/gui_xmdlg.c
+++ b/src/gui_xmdlg.c
@@ -69,7 +69,7 @@
     Display *display = XtDisplay(shell);
 
     /* deactivate the built-in delete response of killing the application */
-    XtVaSetValues(shell, XmNdeleteResponse, XmDO_NOTHING, 0);
+    XtVaSetValues(shell, XmNdeleteResponse, XmDO_NOTHING, NULL);
 
     /* add a delete window protocol callback instead */
     if (!dw_atom)