diff --git a/core/modules/tour/js/tour.js b/core/modules/tour/js/tour.js
index acede2b..bdd8855 100644
--- a/core/modules/tour/js/tour.js
+++ b/core/modules/tour/js/tour.js
@@ -76,6 +76,7 @@
     initialize: function () {
       this.listenTo(this.model, 'change:tour change:isActive', this.render);
       this.listenTo(this.model, 'change:isActive', this.toggleTour);
+      $(document).on('drupalViewportOffsetChange.tour', this.refreshPosition.bind(this));
     },
 
     /**
@@ -118,6 +119,21 @@
     },
 
     /**
+     * Refresh the position of the tour.
+     */
+    refreshPosition: function () {
+      var $tour = this._getTour();
+      if (this.model.get('isActive')) {
+        if ($tour.joyride('is_phone')) {
+          $tour.joyride('pos_phone');
+        }
+        else {
+          $tour.joyride('pos_default');
+        }
+      }
+    },
+
+    /**
      * Toolbar tab click event handler; toggles isActive.
      */
     onClick: function (event) {