diff --git a/napari_plugin_manager/base_qt_plugin_dialog.py b/napari_plugin_manager/base_qt_plugin_dialog.py
index bf1e21c..f3807ac 100644
--- a/napari_plugin_manager/base_qt_plugin_dialog.py
+++ b/napari_plugin_manager/base_qt_plugin_dialog.py
@@ -1190,11 +1190,10 @@ def _loading_gif(self):
         Movie to use to indicate something is loading.
 
         This should return an instance of `QMovie` with a scaled size fo 18x18
-
         """
         raise NotImplementedError
 
-    def _on_bundle(self):
+    def _on_bundle(self) -> bool:
         """
         If the current installation comes from a bundle/standalone approach or not.