diff --git a/lib/galaxy/schema/schema.py b/lib/galaxy/schema/schema.py
index 4d3e89d4b1d2..d121934fad25 100644
--- a/lib/galaxy/schema/schema.py
+++ b/lib/galaxy/schema/schema.py
@@ -998,9 +998,10 @@ class CreateNewCollectionPayload(Model):
         default=None,
         description="The ID of the history that will contain the collection. Required if `instance_type=library`.",
     )
-    fields: Optional[Union[str, List[Dict['str', 'str']]]] = Field(
+    fields_: Optional[Union[str, List[Dict['str', 'str']]]] = Field(
         default=[],
-        description="List of fields to create for this collection. Set to 'auto' to guess fields from identifiers."
+        description="List of fields to create for this collection. Set to 'auto' to guess fields from identifiers.",
+        alias="fields",
     )
 
 
diff --git a/lib/galaxy/webapps/galaxy/services/dataset_collections.py b/lib/galaxy/webapps/galaxy/services/dataset_collections.py
index acf07110c007..d1f0887e53de 100644
--- a/lib/galaxy/webapps/galaxy/services/dataset_collections.py
+++ b/lib/galaxy/webapps/galaxy/services/dataset_collections.py
@@ -119,7 +119,7 @@ def create(self, trans: ProvidesHistoryContext, payload: CreateNewCollectionPayl
         :returns:   element view of new dataset collection
         """
         # TODO: Error handling...
-        create_params = api_payload_to_create_params(payload.dict(exclude_unset=True))
+        create_params = api_payload_to_create_params(payload.dict(exclude_unset=True, by_alias=True))
         if payload.instance_type == DatasetCollectionInstanceType.history:
             if payload.history_id is None:
                 raise exceptions.RequestParameterInvalidException("Parameter history_id is required.")