diff --git a/fritz_temp_sync/fritzbox.py b/fritz_temp_sync/fritzbox.py
index 61b5e45..f49d8f3 100755
--- a/fritz_temp_sync/fritzbox.py
+++ b/fritz_temp_sync/fritzbox.py
@@ -313,11 +313,11 @@ class FritzBox:
             if self.old_fb:
                 new_offset = device["offset"] + real_temp - device["temperature"]
                 offset_changed = new_offset != device["offset"]
-                logging.info(f"Update offset from {device['offset']} to {new_offset} (changed: {offset_changed}")
+                logging.info(f"Update offset from {device['offset']} to {new_offset} (changed: {offset_changed})")
             else:
                 new_offset = device.get_offset() + real_temp - device.get_temperature()
                 offset_changed = new_offset != device.get_offset()
-                logging.info(f"Update offset from {device.get_offset()} to {new_offset} (changed: {offset_changed}")
+                logging.info(f"Update offset from {device.get_offset()} to {new_offset} (changed: {offset_changed})")
 
             if offset_changed:
                 if self.old_fb: