diff --git a/doc/upgrade.rst b/doc/upgrade.rst
index b8a68890a..7b40b92f4 100644
--- a/doc/upgrade.rst
+++ b/doc/upgrade.rst
@@ -62,7 +62,7 @@ use them:
 
 .. sourcecode:: bash
 
-   > sudo -i <modoboa_user>
+   > sudo -u <modoboa_user> -i
    > source <virtuenv_path>/bin/activate
 
 Then, run the following commands: