diff --git a/panda/src/gui/guiManager.cxx b/panda/src/gui/guiManager.cxx
index b6a9cbeb93..7010c83e7f 100644
--- a/panda/src/gui/guiManager.cxx
+++ b/panda/src/gui/guiManager.cxx
@@ -73,7 +73,7 @@ GuiManager* GuiManager::get_ptr(GraphicsWindow* w, MouseAndKeyboard* mak,
       gui_cat->warning() << "overwriting existing button up pattern '"
 			 << watcher->get_button_up_pattern()
 			 << "' with 'gui-%r-%b-up'" << endl;
-    watcher->set_button_up_pattern("gui-%r-%b");
+    watcher->set_button_up_pattern("gui-%r-%b-up");
     if (has_watcher && !watcher->get_enter_pattern().empty())
       gui_cat->warning() << "overwriting existing enter pattern '"
 			 << watcher->get_enter_pattern()