diff --git a/aider/coders/base_coder.py b/aider/coders/base_coder.py
index 2eedfa9b2..f2be758d0 100755
--- a/aider/coders/base_coder.py
+++ b/aider/coders/base_coder.py
@@ -1662,7 +1662,7 @@ class Coder:
         if not self.commit_before_message:
             return
         if self.commit_before_message != self.repo.get_head():
-            self.io.tool_output(f"You can use /undo to undo and discard each aider commit.")
+            self.io.tool_output("You can use /undo to undo and discard each aider commit.")
 
     def dirty_commit(self):
         if not self.need_commit_before_edits: