diff --git a/test-data/unit/pythoneval-asyncio.test b/test-data/unit/pythoneval-asyncio.test
index ffa40a8da68f..b3400fe6010e 100644
--- a/test-data/unit/pythoneval-asyncio.test
+++ b/test-data/unit/pythoneval-asyncio.test
@@ -346,7 +346,7 @@ from typing import Generator, Any
 import asyncio
 from asyncio import Future
 
-asyncio.coroutine
+@asyncio.coroutine
 def slow_operation(future: 'Future[int]') -> 'Generator[Any, None, None]':
     yield from asyncio.sleep(1)
     future.set_result('42')  #Try to set an str as result to a Future[int]