diff --git a/src/resize-observer.js b/src/resize-observer.js
index 1e5683ea..78a884cb 100644
--- a/src/resize-observer.js
+++ b/src/resize-observer.js
@@ -32,7 +32,7 @@ class NativeWrapperResizeObserver {
   }
 
   unobserve() {
-    this.ro.unobserve();
+    this.ro.unobserve(this.el);
   }
 }