diff --git a/packages/graphql/lib/src/core/observable_query.dart b/packages/graphql/lib/src/core/observable_query.dart
index 872e9675a..c85aec0f4 100644
--- a/packages/graphql/lib/src/core/observable_query.dart
+++ b/packages/graphql/lib/src/core/observable_query.dart
@@ -221,7 +221,7 @@ class ObservableQuery {
     }
 
     for (StreamSubscription<QueryResult> subscription in _onDataSubscriptions) {
-      subscription.cancel();
+      await subscription.cancel();
     }
 
     stopPolling();