diff --git a/wp-includes/rest-api/endpoints/class-wp-rest-terms-controller.php b/wp-includes/rest-api/endpoints/class-wp-rest-terms-controller.php
index 7e8c3f89e4..d7c26fa803 100644
--- a/wp-includes/rest-api/endpoints/class-wp-rest-terms-controller.php
+++ b/wp-includes/rest-api/endpoints/class-wp-rest-terms-controller.php
@@ -979,7 +979,10 @@ class WP_REST_Terms_Controller extends WP_REST_Controller {
 
 		$query_params['slug'] = array(
 			'description'       => __( 'Limit result set to terms with a specific slug.' ),
-			'type'              => 'string',
+			'type'              => 'array',
+			'items'             => array(
+				'type'          => 'string'
+			),
 		);
 
 		/**
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 9a8bc1849e..29ee69d98d 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.7.4-alpha-40426';
+$wp_version = '4.7.4-alpha-40427';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.