diff --git a/scm-ui/ui-components/src/apiclient.ts b/scm-ui/ui-components/src/apiclient.ts
index da2287f72b..c8990b000c 100644
--- a/scm-ui/ui-components/src/apiclient.ts
+++ b/scm-ui/ui-components/src/apiclient.ts
@@ -241,7 +241,7 @@ class ApiClient {
       es.addEventListener(type, listeners[type]);
     }
 
-    return es.close;
+    return () => es.close();
   }
 }