diff --git a/scripts/upgrade b/scripts/upgrade
index 0dfd7d8..add4c32 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -306,7 +306,7 @@ fi
 #=================================================
 
 if ynh_psql_execute_as_root --sql='\list' | grep matrix_$app; then
-    ynh_psql_remove_db --db_user="user_wich_must_dont_exist_and_keep_current_user" --db_name=$db_name
+    ynh_''psql_remove_db --db_user="user_wich_must_dont_exist_and_keep_current_user" --db_name=$db_name
     ynh_psql_execute_as_root --sql="ALTER DATABASE matrix_$app RENAME TO $db_name;"
     ynh_psql_execute_as_root --database=$db_name --sql="REASSIGN OWNED BY matrix_$app TO $db_user;"
     ynh_psql_execute_as_root --sql="UPDATE pg_database SET datcollate='C', datctype='C' WHERE datname='$db_name';"
@@ -345,9 +345,9 @@ if grep -q "^matrix-$app" /etc/passwd; then
     # Must stop php before remove user as user is used by php
     systemctl stop php$YNH_PHP_VERSION-fpm.service
 
-    ynh_system_user_delete --username=matrix-$app
+    ynh_''system_user_delete --username=matrix-$app
     yunohost user delete $app || true
-    ynh_system_user_create --username=$app --home_dir=$code_dir
+    ynh_''system_user_create --username=$app --home_dir=$code_dir
     adduser $app ssl-cert
 fi