diff --git a/scripts/upgrade b/scripts/upgrade
index 862c6df5..226cda40 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -223,6 +223,7 @@ ynh_script_progression --message="Creating log file..." --weight=1
 mkdir -p "/var/log/$app/"
 touch "/var/log/$app/${app}-horizon.log"
 chown -R $app: "/var/log/$app/"
+chmod 600 $app: "/var/log/$app/"
 
 #=================================================
 # UPGRADE THE CRON FILE