diff --git a/wp-admin/about.php b/wp-admin/about.php
index 23555aac2..2455bc2bb 100644
--- a/wp-admin/about.php
+++ b/wp-admin/about.php
@@ -10,7 +10,6 @@
 require_once( './admin.php' );
 
 $title = __( 'About' );
-$parent_file = 'index.php';
 
 list( $display_version ) = explode( '-', $wp_version );
 
diff --git a/wp-admin/credits.php b/wp-admin/credits.php
index c2a997901..4e7bfe176 100644
--- a/wp-admin/credits.php
+++ b/wp-admin/credits.php
@@ -10,7 +10,6 @@
 require_once( './admin.php' );
 
 $title = __( 'Credits' );
-$parent_file = 'index.php';
 
 add_contextual_help($current_screen,
 	'<p>' . __('Each name or handle is a link to that person&#8217;s profile in the WordPress.org community directory.') . '</p>' .
diff --git a/wp-admin/freedoms.php b/wp-admin/freedoms.php
index 383f4e67e..3dc6c5926 100644
--- a/wp-admin/freedoms.php
+++ b/wp-admin/freedoms.php
@@ -10,7 +10,6 @@
 require_once( './admin.php' );
 
 $title = __( 'Freedoms' );
-$parent_file = 'index.php';
 
 list( $display_version ) = explode( '-', $wp_version );