diff --git a/aider/io.py b/aider/io.py
index 24108b77b..1ac8d861b 100644
--- a/aider/io.py
+++ b/aider/io.py
@@ -82,7 +82,7 @@ class AutoCompleter(Completer):
                 continue
             try:
                 lexer = guess_lexer_for_filename(fname, content)
-            except Exception as ex:  # On Windows, bad ref to time.clock which is deprecated
+            except Exception:  # On Windows, bad ref to time.clock which is deprecated
                 continue
 
             tokens = list(lexer.get_tokens(content))