diff --git a/core/code/portal_marker.js b/core/code/portal_marker.js
index 9505c903a..5be3898ae 100644
--- a/core/code/portal_marker.js
+++ b/core/code/portal_marker.js
@@ -77,7 +77,7 @@ L.PortalMarker = L.CircleMarker.extend({
   },
   updateDetails: function(details) {
     // portal has been moved
-    if (this.details) {
+    if (this._details) {
       if (this._details.latE6 !== details.latE6 || this._details.lngE6 !== details.lngE6)
         this.setLatLng(L.latLng(details.latE6/1E6, details.lngE6/1E6));