diff --git a/api/core/model_runtime/entities/message_entities.py b/api/core/model_runtime/entities/message_entities.py
index 0d104204bf..579e68c8a1 100644
--- a/api/core/model_runtime/entities/message_entities.py
+++ b/api/core/model_runtime/entities/message_entities.py
@@ -123,6 +123,7 @@ PromptMessageContentUnionTypes = Annotated[
     Field(discriminator="type"),
 ]
 
+
 class PromptMessage(BaseModel):
     """
     Model class for prompt message.
diff --git a/api/tests/unit_tests/core/prompt/test_prompt_message.py b/api/tests/unit_tests/core/prompt/test_prompt_message.py
index 5de713b81a..e5da51d733 100644
--- a/api/tests/unit_tests/core/prompt/test_prompt_message.py
+++ b/api/tests/unit_tests/core/prompt/test_prompt_message.py
@@ -24,4 +24,4 @@ def test_dump_prompt_message():
         ]
     )
     data = prompt.model_dump()
-    assert data["content"][0].get("url") == example_url
\ No newline at end of file
+    assert data["content"][0].get("url") == example_url