diff --git a/wp-includes/class-walker-category.php b/wp-includes/class-walker-category.php
index da518c9ee1..8ef3c58d52 100644
--- a/wp-includes/class-walker-category.php
+++ b/wp-includes/class-walker-category.php
@@ -170,6 +170,13 @@ class Walker_Category extends Walker {
 					} elseif ( $category->term_id == $_current_term->parent ) {
 						$css_classes[] = 'current-cat-parent';
 					}
+					while ( $_current_term->parent ) {
+						if ( $category->term_id == $_current_term->parent ) {
+							$css_classes[] =  'current-cat-ancestor';
+							break;
+						}
+						$_current_term = get_term( $_current_term->parent, $category->taxonomy );
+					}
 				}
 			}
 
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 71197d3a18..7d2b700e7b 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.5-alpha-36007';
+$wp_version = '4.5-alpha-36008';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.