diff --git a/dk b/dk
index 49073ed..3e93dfa 100755
--- a/dk
+++ b/dk
@@ -894,15 +894,14 @@ function default_docker_service() {
 }
 function docker_service() { default_docker_service "$@"; }
 function auto_service() {
-    local -a replace_env_args env_args
-    local -a replace_deploy_args deploy_args
-    local project_name container_name
     if [ -f docker-compose.yml -o -f docker-stack.yml ]; then
         local command="$1"; shift
         [ -n "$command" ] || {
             eerror "Vous devez spécifier la commande"
             return 1
         }
+        local -a command_args
+        [ "$command" == update -a -n "$WITH_REGISTRY_AUTH" ] && command_args+=(--with-registry-auth)
         case "$command" in
         ls) # ces commandes n'ont pas besoin du nom de service
             docker_service "$command" "$@"
@@ -913,9 +912,12 @@ function auto_service() {
                 eerror "Vous devez spécifier le nom du service"
                 return 1
             }
+            local -a replace_env_args env_args
+            local -a replace_deploy_args deploy_args
+            local project_name container_name
             docker_set_deploy_args set_container_name
             service="${container_name}_${service#${container_name}_}"
-            docker_service "$command" "$@" "$service"
+            docker_service "$command" "${command_args[@]}" "$@" "$service"
             ;;
         esac
     else