diff --git a/vcr/cassette.py b/vcr/cassette.py
index c9f81a1..1ac06dd 100644
--- a/vcr/cassette.py
+++ b/vcr/cassette.py
@@ -3,7 +3,7 @@ import contextlib
 import copy
 import inspect
 import logging
-from asyncio import iscoroutinefunction
+from inspect import iscoroutinefunction
 
 import wrapt