diff --git a/ngsw-worker.js b/ngsw-worker.js
index b2b31de3c2..d3bea401b1 100755
--- a/ngsw-worker.js
+++ b/ngsw-worker.js
@@ -855,7 +855,7 @@ ${error.stack}`;
     }
     async safeFetch(req) {
       try {
-        return this.scope.fetch(req);
+        return await this.scope.fetch(req);
       } catch (e) {
         return this.adapter.newResponse(null, {
           status: 504,