diff --git a/scripts/vendorsjs.sh b/scripts/vendorsjs.sh
index fbcd906d..6236936e 100755
--- a/scripts/vendorsjs.sh
+++ b/scripts/vendorsjs.sh
@@ -20,7 +20,9 @@ mkdir -p umap/static/umap/vendors/measurable/ && cp -r node_modules/leaflet-meas
 mkdir -p umap/static/umap/vendors/photon/ && cp -r node_modules/leaflet.photon/leaflet.photon.js umap/static/umap/vendors/photon/
 mkdir -p umap/static/umap/vendors/csv2geojson/ && cp -r node_modules/csv2geojson/csv2geojson.js umap/static/umap/vendors/csv2geojson/
 mkdir -p umap/static/umap/vendors/togeojson/ && cp node_modules/@tmcw/togeojson/dist/togeojson.es.mjs umap/static/umap/vendors/togeojson/togeojson.es.js
+mkdir -p umap/static/umap/vendors/togeojson/ && cp node_modules/@tmcw/togeojson/dist/togeojson.es.mjs.map umap/static/umap/vendors/togeojson/togeojson.es.mjs.map
 mkdir -p umap/static/umap/vendors/tokml/ && cp node_modules/@placemarkio/tokml/dist/tokml.es.mjs umap/static/umap/vendors/tokml/tokml.es.js
+mkdir -p umap/static/umap/vendors/tokml/ && cp node_modules/@placemarkio/tokml/dist/tokml.es.mjs.map umap/static/umap/vendors/tokml/tokml.es.mjs.map
 mkdir -p umap/static/umap/vendors/osmtogeojson/ && cp -r node_modules/osmtogeojson/osmtogeojson.js umap/static/umap/vendors/osmtogeojson/
 mkdir -p umap/static/umap/vendors/georsstogeojson/ && cp -r node_modules/georsstogeojson/GeoRSSToGeoJSON.js umap/static/umap/vendors/georsstogeojson/
 mkdir -p umap/static/umap/vendors/locatecontrol/ && cp -r node_modules/leaflet.locatecontrol/dist/L.Control.Locate.min.* umap/static/umap/vendors/locatecontrol/
diff --git a/umap/storage.py b/umap/storage.py
index aaa6aee8..aa185428 100644
--- a/umap/storage.py
+++ b/umap/storage.py
@@ -32,7 +32,7 @@ class UmapManifestStaticFilesStorage(ManifestStaticFilesStorage):
                 'import"%(url)s"\n',
             ),
             (
-                r"""(?P<matched>import\(["'](?P<url>.*?)["']\))""",
+                r"""(?P<matched>import\(["'](?P<url>.*?)["']\))\.then""",
                 """import("%(url)s")""",
             ),
         ),