diff --git a/setup/zpush.sh b/setup/zpush.sh
index 4088192d..193e4106 100755
--- a/setup/zpush.sh
+++ b/setup/zpush.sh
@@ -47,6 +47,7 @@ fi
 # Configure default config.
 sed -i "s^define('TIMEZONE', .*^define('TIMEZONE', '$(cat /etc/timezone)');^" /usr/local/lib/z-push/config.php
 sed -i "s/define('BACKEND_PROVIDER', .*/define('BACKEND_PROVIDER', 'BackendCombined');/" /usr/local/lib/z-push/config.php
+sed -i "s/define('USE_FULLEMAIL_FOR_LOGIN', .*/define('USE_FULLEMAIL_FOR_LOGIN', true);/" /usr/local/lib/z-push/config.php
 
 # Configure BACKEND
 rm -f /usr/local/lib/z-push/backend/combined/config.php