diff --git a/page-pins.php b/page-pins.php
index a4b917c..80cfc27 100644
--- a/page-pins.php
+++ b/page-pins.php
@@ -112,7 +112,7 @@
     }
     function filterMarkersByTraveler(traveler){
         for(var i=0; i<markers.length; i++){
-            if(markers[i]['traveler'].index(traveler) > -1){
+            if(markers[i]['traveler'].indexOf(traveler) > -1){
                 markers[i].setVisible(true);
             } else {
                 markers[i].setVisible(false);