diff --git a/check_process b/check_process
index 98d6a69..603e7e6 100644
--- a/check_process
+++ b/check_process
@@ -18,7 +18,6 @@
 		upgrade=1	from_commit=f618522e430dfcb63e1a5843535cf0da165025f3
 		backup_restore=1
 		multi_instance=1
-		port_already_use=0
 		change_url=1
 ;;; Options
 Email=
diff --git a/scripts/install b/scripts/install
old mode 100755
new mode 100644
diff --git a/scripts/restore b/scripts/restore
old mode 100755
new mode 100644
diff --git a/scripts/upgrade b/scripts/upgrade
old mode 100755
new mode 100644
index ddf1c7a..2c44578
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -43,6 +43,14 @@ ynh_clean_setup () {
 # Exit if an error occurs during the execution of the script
 ynh_abort_if_errors
 
+#=================================================
+# CREATE DEDICATED USER
+#=================================================
+ynh_script_progression --message="Making sure dedicated system user exists..."
+
+# Create a dedicated user (if not existing)
+ynh_system_user_create --username=$app --home_dir="$final_path"
+
 #=================================================
 # STANDARD UPGRADE STEPS
 #=================================================