diff --git a/aiosched/util/sigint.py b/aiosched/util/sigint.py
index 0e0ce46..1cb9a85 100644
--- a/aiosched/util/sigint.py
+++ b/aiosched/util/sigint.py
@@ -18,7 +18,6 @@ limitations under the License.
 import sys
 import inspect
 from functools import wraps
-from typing import Callable
 from types import FrameType