diff --git a/stapler/token_manager.py b/stapler/token_manager.py
index 3495265..9330213 100644
--- a/stapler/token_manager.py
+++ b/stapler/token_manager.py
@@ -67,10 +67,11 @@ class TokenManager:
     def detect_file_change(self) -> bool:
         if (
             self.tokens_file.exists()
-            and self.tokens_file.stat().st_mtime != self.last_file_change
+            and (file_change := self.tokens_file.stat().st_mtime)
+            != self.last_file_change
         ):
             self.logger.debug("Detected change: %s", self.tokens_file)
-            self.last_file_change = self.tokens_file.stat().st_mtime
+            self.last_file_change = file_change
             return True
         return False