diff --git a/backend/open_webui/routers/ollama.py b/backend/open_webui/routers/ollama.py
index 233e30ce5..0c152c1f0 100644
--- a/backend/open_webui/routers/ollama.py
+++ b/backend/open_webui/routers/ollama.py
@@ -917,7 +917,7 @@ class ChatMessage(BaseModel):
 class GenerateChatCompletionForm(BaseModel):
     model: str
     messages: list[ChatMessage]
-    format: Optional[str] = None
+    format: Optional[dict] = None
     options: Optional[dict] = None
     template: Optional[str] = None
     stream: Optional[bool] = True
diff --git a/backend/open_webui/utils/payload.py b/backend/open_webui/utils/payload.py
index 04e3a98c4..0125a799c 100644
--- a/backend/open_webui/utils/payload.py
+++ b/backend/open_webui/utils/payload.py
@@ -154,6 +154,9 @@ def convert_payload_openai_to_ollama(openai_payload: dict) -> dict:
     )
     ollama_payload["stream"] = openai_payload.get("stream", False)
 
+    if "format" in openai_payload:
+        ollama_payload["format"] = openai_payload["format"]
+
     # If there are advanced parameters in the payload, format them in Ollama's options field
     ollama_options = {}