diff --git a/tests/test_utils_run_later.py b/tests/test_utils_run_later.py
index 143dba718..e15c035cd 100644
--- a/tests/test_utils_run_later.py
+++ b/tests/test_utils_run_later.py
@@ -1,4 +1,5 @@
 import pytest
+import io
 import time_machine
 from datetime import datetime, timedelta