diff --git a/aider/io.py b/aider/io.py
index 3109cf275..3496fa1b7 100644
--- a/aider/io.py
+++ b/aider/io.py
@@ -2,6 +2,7 @@ import base64
 import functools
 import os
 import signal
+import subprocess
 import time
 import webbrowser
 from collections import defaultdict