diff --git a/fastapi/utils.py b/fastapi/utils.py
index 18108bc3a..311c036e2 100644
--- a/fastapi/utils.py
+++ b/fastapi/utils.py
@@ -121,7 +121,7 @@ def create_model_field(
         try:
             return v2.ModelField(**kwargs)  # type: ignore[return-value,arg-type]
         except PydanticSchemaGenerationError:
-            raise fastapi.exceptions.FastAPIError(_invalid_args_message.format(type_=type_) from None
+            raise fastapi.exceptions.FastAPIError(_invalid_args_message.format(type_=type_)) from None
     # Pydantic v2 is not installed, but it's not a Pydantic v1 ModelField, it could be
     # a Pydantic v1 type, like a constrained int
     from fastapi._compat import v1
@@ -129,7 +129,7 @@ def create_model_field(
     try:
         return v1.ModelField(**v1_kwargs)  # type: ignore[no-any-return]
     except RuntimeError:
-        raise fastapi.exceptions.FastAPIError(_invalid_args_message.format(type_=type_) from None
+        raise fastapi.exceptions.FastAPIError(_invalid_args_message.format(type_=type_)) from None
 
 
 def create_cloned_field(