diff --git a/src/wp-includes/rest-api/class-wp-rest-request.php b/src/wp-includes/rest-api/class-wp-rest-request.php
index dee352c340..fdf13c46d1 100644
--- a/src/wp-includes/rest-api/class-wp-rest-request.php
+++ b/src/wp-includes/rest-api/class-wp-rest-request.php
@@ -847,7 +847,7 @@ class WP_REST_Request implements ArrayAccess {
 				$valid_check = call_user_func( $arg['validate_callback'], $param, $this, $key );
 
 				if ( false === $valid_check ) {
-					$invalid_params[ $key ] = __( 'Invalid param.' );
+					$invalid_params[ $key ] = __( 'Invalid parameter.' );
 				}
 
 				if ( is_wp_error( $valid_check ) ) {