diff --git a/flaschengeist/plugins/auth_ldap/__init__.py b/flaschengeist/plugins/auth_ldap/__init__.py
index f017815..ab001a2 100644
--- a/flaschengeist/plugins/auth_ldap/__init__.py
+++ b/flaschengeist/plugins/auth_ldap/__init__.py
@@ -147,7 +147,7 @@ class AuthLDAP(AuthPlugin):
         if "jpegPhoto" in r and len(r["jpegPhoto"]) > 0:
             avatar = _Avatar()
             avatar.mimetype = "image/jpeg"
-            avatar.binary.extend(r["jpegPhoto"][0])
+            avatar.binary = bytearray(r['jpegPhoto'][0])
             return avatar
         else:
             raise NotFound