diff --git a/php/classes/class-qsm-quiz-api.php b/php/classes/class-qsm-quiz-api.php
index de88ac73..674efb21 100644
--- a/php/classes/class-qsm-quiz-api.php
+++ b/php/classes/class-qsm-quiz-api.php
@@ -131,6 +131,7 @@ public function qsm_get_quiz_result_info( WP_REST_Request $request ) {
 				$email = $request->get_param('email');
 				$from_date = $request->get_param('from_date');
 				$order = $request->get_param('order');
+				$user_id = $request->get_param('user_id');
 				$s = $request->get_param('s');
 
 				$query = "SELECT * FROM {$wpdb->prefix}mlw_results WHERE 1=1";
@@ -154,6 +155,10 @@ public function qsm_get_quiz_result_info( WP_REST_Request $request ) {
 					$query .= $wpdb->prepare(" AND email = %s", $email);
 				}
 
+				if ( ! empty($user_id) ) {
+					$query .= $wpdb->prepare(" AND user = %d", $user_id);
+				}
+
 				if ( ! empty($from_date) ) {
 					$query .= $wpdb->prepare( " AND time_taken_real >= %s", $from_date );
 				}