diff --git a/tortoise/models.py b/tortoise/models.py
index 8436a46ee..83de86890 100644
--- a/tortoise/models.py
+++ b/tortoise/models.py
@@ -1062,7 +1062,11 @@ async def get_or_create(
                 )
             except DoesNotExist:
                 try:
-                    return await cls.create(using_db=connection, **defaults, **kwargs), True
+                    merged_defaults = {**defaults, **kwargs}
+                    return (
+                        await cls.create(using_db=connection, **merged_defaults),
+                        True,
+                    )
                 except (IntegrityError, TransactionManagementError):
                     return await cls.filter(**kwargs).using_db(connection).get(), False