diff --git a/data/helpers.d/php b/data/helpers.d/php
index 489c448a8..c538d8688 100644
--- a/data/helpers.d/php
+++ b/data/helpers.d/php
@@ -219,7 +219,7 @@ ynh_add_fpm_config () {
 
     if [ -e "../conf/php-fpm.ini" ]
     then
-        ynh_print_warn -message="Packagers ! Please do not use a separate php ini file, merge your directives in the pool file instead."
+        ynh_print_warn --message="Packagers ! Please do not use a separate php ini file, merge your directives in the pool file instead."
         finalphpini="$fpm_config_dir/conf.d/20-$app.ini"
         ynh_backup_if_checksum_is_different "$finalphpini"
         cp ../conf/php-fpm.ini "$finalphpini"