diff --git a/scripts/backup b/scripts/backup
index 69d65fe..b6fe94e 100644
--- a/scripts/backup
+++ b/scripts/backup
@@ -4,7 +4,7 @@
 set -eu
 
 # Load common variables and functions
-source ./_common.sh
+source ./_common
 
 domain=$(ynh_app_setting_get "$app" domain)