diff --git a/src/ResizeSensor.js b/src/ResizeSensor.js
index d03e17d..fcc6597 100755
--- a/src/ResizeSensor.js
+++ b/src/ResizeSensor.js
@@ -267,7 +267,9 @@
 
         this.detach = function(ev) {
             if (typeof ResizeObserver != "undefined") {
-               observer.unobserve(element);
+                forEachElement(element, function(elem){
+                    observer.unobserve(elem);
+                });
             }
             else {
                 ResizeSensor.detach(element, ev);