diff --git a/deepmd/dpmodel/fitting/property_fitting.py b/deepmd/dpmodel/fitting/property_fitting.py
index 757a32c04f..fd8249cf25 100644
--- a/deepmd/dpmodel/fitting/property_fitting.py
+++ b/deepmd/dpmodel/fitting/property_fitting.py
@@ -88,4 +88,4 @@ def serialize(self) -> dict:
             "task_dim": self.task_dim,
         }
 
-        return dd
\ No newline at end of file
+        return dd