diff --git a/src/c3nav/editor/static/editor/js/editor.js b/src/c3nav/editor/static/editor/js/editor.js
index 9c7dc03f..64f438e1 100644
--- a/src/c3nav/editor/static/editor/js/editor.js
+++ b/src/c3nav/editor/static/editor/js/editor.js
@@ -99,7 +99,6 @@ editor = {
                     const sources = sourceGroups[key];
                     for (var i = 0; i < sources.length; i++) {
                         const source = sources[i];
-                        editor.sources[source.id] = source;
                         const bounds = L.GeoJSON.coordsToLatLngs(source.bounds);
                         options = {opacity: 0.3};
                         source.layer = L.imageOverlay('/editor/sourceimage/' + source.name, bounds, options);