diff --git a/scripts/upgrade b/scripts/upgrade
index 6f0af00..5830c99 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -15,7 +15,7 @@ source /usr/share/yunohost/helpers
 #=================================================
 ynh_script_progression --message="Loading installation settings..."
 
-app= $YNH_APP_INSTANCE_NAME
+app=$YNH_APP_INSTANCE_NAME
 
 domain=$(ynh_app_setting_get       --app=$app --key=domain)
 path_url=$(ynh_app_setting_get     --app=$app --key=path)