diff --git a/modules/api/api.py b/modules/api/api.py
index 3e42dd7b1..4e6560826 100644
--- a/modules/api/api.py
+++ b/modules/api/api.py
@@ -99,7 +99,7 @@ def decode_base64_to_image(encoding):
         raise HTTPException(status_code=500, detail="Invalid encoded image") from e
 
 
-def encode_pil_to_base64(image: Image.Image):
+def encode_pil_to_base64(image):
     with io.BytesIO() as output_bytes:
         if isinstance(image, str):
             return image