diff --git a/umap/static/umap/map.css b/umap/static/umap/map.css
index d7e3f0e9..22783daf 100644
--- a/umap/static/umap/map.css
+++ b/umap/static/umap/map.css
@@ -1316,6 +1316,7 @@ a.add-datalayer:hover,
 }
 .leaflet-popup-content-wrapper {
     border-radius: 4px;
+    overflow-y: scroll;
 }
 .umap-popup-content {
     max-height: 500px;