diff --git a/tenacity/tests/test_asyncio.py b/tenacity/tests/test_asyncio.py
index <HASH>..<HASH> 100644
--- a/tenacity/tests/test_asyncio.py
+++ b/tenacity/tests/test_asyncio.py
@@ -36,9 +36,8 @@ def asynctest(callable_):
 
 
 @retry
-@asyncio.coroutine
-def _retryable_coroutine(thing):
-    yield from asyncio.sleep(0.00001)
+async def _retryable_coroutine(thing):
+    await asyncio.sleep(0.00001)
     return thing.go()
Test async keyword

This is possible since tenacity dropped support for <I>.