diff --git a/tbump/file_bumper.py b/tbump/file_bumper.py
index f8c957d..f8f2167 100644
--- a/tbump/file_bumper.py
+++ b/tbump/file_bumper.py
@@ -29,6 +29,7 @@ def __init__(
         self.lineno = lineno
         self.old_line = old_line
         self.new_line = new_line
+        unused_variable = "unused"
 
     def print_self(self) -> None:
         from tbump.cli import print_diff