diff --git a/manifest.json b/manifest.json
index 9dc98ad..e76dca7 100644
--- a/manifest.json
+++ b/manifest.json
@@ -11,7 +11,7 @@
     "maintainer": {
         "name": "scith, Djip007"
     },
-    "multi_instance": "false",
+    "multi_instance": false,
     "services": [
         "nginx",
         "php5-fpm",
diff --git a/scripts/install b/scripts/install
index c96ae3d..f588598 100644
--- a/scripts/install
+++ b/scripts/install
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 # Exit on command errors and treat unset variables as an error
 set -eu
 app=$YNH_APP_INSTANCE_NAME
diff --git a/scripts/remove b/scripts/remove
index bfed4a9..fcbc11e 100644
--- a/scripts/remove
+++ b/scripts/remove
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 # Exit on command errors and treat unset variables as an error
 set -eu
 app=$YNH_APP_INSTANCE_NAME
diff --git a/scripts/restore b/scripts/restore
index c26e989..50edf6c 100644
--- a/scripts/restore
+++ b/scripts/restore
@@ -6,16 +6,14 @@ set -eu
 # Get multi-instances specific variables
 app=$YNH_APP_INSTANCE_NAME
 
-# Set app specific variables
-dbname=$app
-dbuser=$app
-
 # Source app helpers
 . /usr/share/yunohost/helpers
 
 # Retrieve old app settings
 domain=$(ynh_app_setting_get "$app" domain)
 path=$(ynh_app_setting_get "$app" path)
+dbname=$app
+dbuser=$app
 dbpass=$(ynh_app_setting_get "$app" mysqlpwd)
 
 # Check domain/path availability
diff --git a/scripts/upgrade b/scripts/upgrade
index a65b0bd..f7b726e 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -1,3 +1,5 @@
+#!/bin/bash
+
 # Exit on command errors and treat unset variables as an error
 set -eu
 app=$YNH_APP_INSTANCE_NAME