diff --git a/scripts/install b/scripts/install
index a3aec25..c0c316f 100644
--- a/scripts/install
+++ b/scripts/install
@@ -51,20 +51,20 @@ final_path=/var/www/$app
 test ! -e "$final_path" || ynh_die "This path already contains a folder"
 
 # Normalize the url path syntax
-path_url=$(ynh_normalize_url_path $path_url)
+path_url=$(ynh_normalize_url_path "$path_url")
 
 # Check web path availability
-ynh_webpath_available $domain $path_url
+ynh_webpath_available "$domain" "$path_url"
 # Register (book) web path
-ynh_webpath_register $app $domain $path_url
+ynh_webpath_register "$app" "$domain" "$path_url"
 
 #=================================================
 # STORE SETTINGS FROM MANIFEST
 #=================================================
 
-ynh_app_setting_set $app domain $domain
-ynh_app_setting_set $app path $path_url
-ynh_app_setting_set $app is_public $is_public
+ynh_app_setting_set "$app" domain "$domain"
+ynh_app_setting_set "$app" path "$path_url"
+ynh_app_setting_set "$app" is_public "$is_public"
 
 #=================================================
 # INSTALL DEPENDENCIES
@@ -96,15 +96,15 @@ ynh_print_info "Creating a MySQL database..."
 ###		- Remove also the section "REMOVE THE MYSQL DATABASE" in the remove script
 ###		- As well as the section "RESTORE THE MYSQL DATABASE" in the restore script
 
-db_name=$(ynh_sanitize_dbid $app)
-ynh_app_setting_set $app db_name $db_name
-ynh_mysql_setup_db $db_name $db_name
+db_name=$(ynh_sanitize_dbid "$app")
+ynh_app_setting_set "$app" db_name "$db_name"
+ynh_mysql_setup_db "$db_name" "$db_name"
 
 #=================================================
 # DOWNLOAD, CHECK AND UNPACK SOURCE
 #=================================================
 
-ynh_app_setting_set $app final_path $final_path
+ynh_app_setting_set "$app" final_path "$final_path"
 # Download, check integrity, uncompress and patch the source from app.src
 ynh_setup_source "$final_path"
 
@@ -120,13 +120,13 @@ ynh_add_nginx_config
 #=================================================
 
 # Create a system user
-ynh_system_user_create $app
+ynh_system_user_create "$app"
 
 #=================================================
 # MODIFY A CONFIG FILE
 #=================================================
 
-cp -a ../conf/config.dist.php $final_path/config.php
+cp -a ../conf/config.dist.php "$final_path"/config.php
 
 ynh_replace_string "yunouser"   "$db_name"    "$final_path/config.php"
 ynh_replace_string "yunopass"   "$db_pwd"     "$final_path/config.php"
@@ -154,14 +154,14 @@ ynh_replace_string "yunobase"   "$db_name"    "$final_path/config.php"
 ### that really need such authorization.
 
 # Set permissions to app files
-chown -R www-data:www-data $final_path
+chown -R www-data: "$final_path"
 
 #=================================================
 # SETUP SSOWAT
 #=================================================
 
 # If app is public, add url to SSOWat conf as skipped_uris
-if [ $is_public -eq 1 ]; then
+if [ "$is_public" -eq 1 ]; then
   # unprotected_uris allows SSO credentials to be passed anyway.
   ynh_app_setting_set "$app" unprotected_uris "/"
 fi