diff --git a/api/libs/helper.py b/api/libs/helper.py
index b878141d8e..60484dd40b 100644
--- a/api/libs/helper.py
+++ b/api/libs/helper.py
@@ -81,6 +81,8 @@ class AvatarUrlField(fields.Raw):
         from models import Account
 
         if isinstance(obj, Account) and obj.avatar is not None:
+            if obj.avatar.startswith(("http://", "https://")):
+                return obj.avatar
             return file_helpers.get_signed_file_url(obj.avatar)
         return None