diff --git a/tests/py36/middlewares.py b/tests/py36/middlewares.py
index 6529943d3..182610f30 100644
--- a/tests/py36/middlewares.py
+++ b/tests/py36/middlewares.py
@@ -1,2 +1,3 @@
-def RequestInOrderMiddleware_process_start_requests(f, start_requests, spider):
-    return (f(r, spider) async for r in start_requests or ())
+async def RequestInOrderMiddleware_process_start_requests(f, start_requests, spider):
+    async for r in start_requests or ():
+        yield f(r, spider)