diff --git a/decart/client.py b/decart/client.py
index 10e0fad..9f02b95 100644
--- a/decart/client.py
+++ b/decart/client.py
@@ -175,7 +175,7 @@ async def process(self, options: dict[str, Any]) -> bytes:
         inputs = {k: v for k, v in options.items() if k not in ("model", "cancel_token")}
 
         # File fields that need special handling (not validated by Pydantic)
-        FILE_FIELDS = {"data", "start", "end"}
+        FILE_FIELDS = {"data", "start", "end", "reference_image"}
 
         # Separate file inputs from regular inputs
         file_inputs = {k: v for k, v in inputs.items() if k in FILE_FIELDS}
diff --git a/decart/queue/client.py b/decart/queue/client.py
index f85686b..43fb1c5 100644
--- a/decart/queue/client.py
+++ b/decart/queue/client.py
@@ -95,7 +95,7 @@ async def submit(self, options: dict[str, Any]) -> JobSubmitResponse:
         inputs = {k: v for k, v in options.items() if k not in ("model", "cancel_token")}
 
         # File fields that need special handling
-        FILE_FIELDS = {"data", "start", "end"}
+        FILE_FIELDS = {"data", "start", "end", "reference_image"}
 
         # Separate file inputs from regular inputs
         file_inputs = {k: v for k, v in inputs.items() if k in FILE_FIELDS}