diff --git a/wp-includes/link-template.php b/wp-includes/link-template.php
index 416b1243fa..a8c6836864 100644
--- a/wp-includes/link-template.php
+++ b/wp-includes/link-template.php
@@ -191,8 +191,8 @@ function get_permalink( $post = 0, $leavename = false ) {
 
 				$category_object = get_term( $category_object, 'category' );
 				$category        = $category_object->slug;
-				if ( $parent = $category_object->parent ) {
-					$category = get_category_parents( $parent, false, '/', true ) . $category;
+				if ( $category_object->parent ) {
+					$category = get_category_parents( $category_object->parent, false, '/', true ) . $category;
 				}
 			}
 			// show default category in permalinks, without
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 2f7169d088..f4d50b519d 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.0-alpha-42377';
+$wp_version = '5.0-alpha-42378';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.