diff --git a/src/diffusers/modular_pipelines/modular_pipeline.py b/src/diffusers/modular_pipelines/modular_pipeline.py
index 9e2fca465e..e3602bf1cb 100644
--- a/src/diffusers/modular_pipelines/modular_pipeline.py
+++ b/src/diffusers/modular_pipelines/modular_pipeline.py
@@ -1603,7 +1603,9 @@ class ModularPipeline(ConfigMixin, PushToHubMixin):
         for name, config_spec in self._config_specs.items():
             default_configs[name] = config_spec.default
         self.register_to_config(**default_configs)
-        self.register_to_config(_blocks_class_name=self._blocks.__class__.__name__ if self._blocks is not None else None)
+        self.register_to_config(
+            _blocks_class_name=self._blocks.__class__.__name__ if self._blocks is not None else None
+        )
 
     @property
     def default_call_parameters(self) -> Dict[str, Any]: