diff --git a/mellon/utils.py b/mellon/utils.py
index b221860..7fe205e 100644
--- a/mellon/utils.py
+++ b/mellon/utils.py
@@ -223,7 +223,7 @@ def create_logout(request):
     })
     logger.debug('session_dump %s', session_dump)
     logout = lasso.Logout(server)
-    if not app_settings.PRIVATE_KEY:
+    if not app_settings.PRIVATE_KEY and not app_settings.PRIVATE_KEYS:
         logout.setSignatureHint(lasso.PROFILE_SIGNATURE_HINT_FORBID)
     logout.setSessionFromDump(session_dump)
     return logout