diff --git a/includes/wccom-site/rest-api/endpoints/class-wc-rest-wccom-site-installer-controller.php b/includes/wccom-site/rest-api/endpoints/class-wc-rest-wccom-site-installer-controller.php
index c2169e4fe8c..b07fb7f1687 100644
--- a/includes/wccom-site/rest-api/endpoints/class-wc-rest-wccom-site-installer-controller.php
+++ b/includes/wccom-site/rest-api/endpoints/class-wc-rest-wccom-site-installer-controller.php
@@ -51,6 +51,12 @@ class WC_REST_WCCOM_Site_Installer_Controller extends WC_REST_Controller {
 					'methods'             => WP_REST_Server::CREATABLE,
 					'callback'            => array( $this, 'install' ),
 					'permission_callback' => array( $this, 'check_permission' ),
+					'args'                => array(
+						'products' => array(
+							'required' => true,
+							'type'     => 'array',
+						),
+					),
 				),
 				array(
 					'methods'             => WP_REST_Server::DELETABLE,