diff --git a/scripts/install b/scripts/install
index edeafbd..0de629c 100755
--- a/scripts/install
+++ b/scripts/install
@@ -17,7 +17,7 @@ admin_user=$3
 
 # Check user parameter if not empty
 if [[ $admin_user != '' ]]; then
-    sudo yunohost user list --json | grep -qi "\"username\": \"$admin_user\""
+    ynh_user_exists $admin_user
     if [[ ! $? -eq 0 ]]; then
         echo "Wrong user"
         exit 1