diff --git a/src/observable/BaseObservableCollection.js b/src/observable/BaseObservableCollection.js
index 13b059ae..f9370f10 100644
--- a/src/observable/BaseObservableCollection.js
+++ b/src/observable/BaseObservableCollection.js
@@ -45,9 +45,8 @@ export function tests() {
     return {
         test_unsubscribe(assert) {
             const c = new Collection();
-            const subscription = c.subscribe({});
-            // unsubscribe
-            subscription();
+            const unsubscribe = c.subscribe({});
+            unsubscribe();
             assert.equal(c.firstSubscribeCalls, 1);
             assert.equal(c.firstUnsubscribeCalls, 1);
         }