diff --git a/scripts/upgrade b/scripts/upgrade
index 606475b..0e1a825 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 # Retrieve arguments
 domain=$(sudo yunohost app setting searx domain)
 path=$(sudo yunohost app setting searx path)
@@ -19,7 +21,6 @@ then
     sudo swapon $tmp_swap_file
 fi
 
-
 # Init virtualenv
 if [ ! -d /opt/searx ];
 then