diff --git a/js/bootstrap-tooltip.js b/js/bootstrap-tooltip.js
index c23d8267a8..9ba2d1214a 100644
--- a/js/bootstrap-tooltip.js
+++ b/js/bootstrap-tooltip.js
@@ -212,7 +212,7 @@
 
   , getPosition: function () {
       var el = this.$element[0]
-      return $.extend({}, el.getBoundingClientRect ? el.getBoundingClientRect() : {
+      return $.extend({}, (typeof el.getBoundingClientRect == 'function') ? el.getBoundingClientRect() : {
         width: el.offsetWidth
       , height: el.offsetHeight
       }, this.$element.offset())