diff --git a/python/jupyter_leaflet/package.json b/python/jupyter_leaflet/package.json
index 89416370..8278b93f 100644
--- a/python/jupyter_leaflet/package.json
+++ b/python/jupyter_leaflet/package.json
@@ -102,6 +102,9 @@
       "@jupyter-widgets/base": {
         "bundled": false,
         "singleton": true
+      },
+      "leaflet": {
+        "singleton": true
       }
     }
   }