diff --git a/src/llm_models/utils_model.py b/src/llm_models/utils_model.py
index 215b0f739..1f90a730a 100644
--- a/src/llm_models/utils_model.py
+++ b/src/llm_models/utils_model.py
@@ -216,7 +216,7 @@ class LLMRequest:
         prompt: str = None,
         image_base64: str = None,
         image_format: str = None,
-        file_bytes: str = None,
+        file_bytes: bytes = None,
         file_format: str = None,
         payload: dict = None,
         retry_policy: dict = None,
@@ -296,7 +296,7 @@ class LLMRequest:
         prompt: str = None,
         image_base64: str = None,
         image_format: str = None,
-        file_bytes: str = None,
+        file_bytes: bytes = None,
         file_format: str = None,
         payload: dict = None,
         retry_policy: dict = None,