diff --git a/src/wp-admin/menu-header.php b/src/wp-admin/menu-header.php
index ee90d23152..ec2ec338e7 100644
--- a/src/wp-admin/menu-header.php
+++ b/src/wp-admin/menu-header.php
@@ -68,6 +68,7 @@ get_admin_page_parent();
 function _wp_menu_output( $menu, $submenu, $submenu_as_parent = true ) {
 	global $self, $parent_file, $submenu_file, $plugin_page, $typenow;
 
+	$admin_url = admin_url();
 	$first = true;
 	// 0 = menu_title, 1 = capability, 2 = menu_slug, 3 = page_title, 4 = classes, 5 = hookname, 6 = icon_url.
 	foreach ( $menu as $key => $item ) {
@@ -166,9 +167,9 @@ function _wp_menu_output( $menu, $submenu, $submenu_as_parent = true ) {
 					&& ! file_exists( ABSPATH . "/wp-admin/$menu_file" ) )
 			) {
 				$admin_is_parent = true;
-				echo "<a href='admin.php?page={$submenu_items[0][2]}'$class $aria_attributes>$arrow<div class='wp-menu-image$img_class'$img_style aria-hidden='true'>$img</div><div class='wp-menu-name'>$title</div></a>";
+				echo "<a href='" . WP_Http::make_absolute_url( "admin.php?page={$submenu_items[0][2]}", $admin_url ) . "'$class $aria_attributes>$arrow<div class='wp-menu-image$img_class'$img_style aria-hidden='true'>$img</div><div class='wp-menu-name'>$title</div></a>";
 			} else {
-				echo "\n\t<a href='{$submenu_items[0][2]}'$class $aria_attributes>$arrow<div class='wp-menu-image$img_class'$img_style aria-hidden='true'>$img</div><div class='wp-menu-name'>$title</div></a>";
+				echo "\n\t<a href='" . WP_Http::make_absolute_url( $submenu_items[0][2], $admin_url ) . "'$class $aria_attributes>$arrow<div class='wp-menu-image$img_class'$img_style aria-hidden='true'>$img</div><div class='wp-menu-name'>$title</div></a>";
 			}
 		} elseif ( ! empty( $item[2] ) && current_user_can( $item[1] ) ) {
 			$menu_hook = get_plugin_page_hook( $item[2], 'admin.php' );
@@ -185,9 +186,9 @@ function _wp_menu_output( $menu, $submenu, $submenu_as_parent = true ) {
 					&& ! file_exists( ABSPATH . "/wp-admin/$menu_file" ) )
 			) {
 				$admin_is_parent = true;
-				echo "\n\t<a href='admin.php?page={$item[2]}'$class $aria_attributes>$arrow<div class='wp-menu-image$img_class'$img_style aria-hidden='true'>$img</div><div class='wp-menu-name'>{$item[0]}</div></a>";
+				echo "\n\t<a href='" . WP_Http::make_absolute_url( "admin.php?page={$item[2]}", $admin_url ) . "'$class $aria_attributes>$arrow<div class='wp-menu-image$img_class'$img_style aria-hidden='true'>$img</div><div class='wp-menu-name'>{$item[0]}</div></a>";
 			} else {
-				echo "\n\t<a href='{$item[2]}'$class $aria_attributes>$arrow<div class='wp-menu-image$img_class'$img_style aria-hidden='true'>$img</div><div class='wp-menu-name'>{$item[0]}</div></a>";
+				echo "\n\t<a href='" . WP_Http::make_absolute_url( $item[2], $admin_url ) . "'$class $aria_attributes>$arrow<div class='wp-menu-image$img_class'$img_style aria-hidden='true'>$img</div><div class='wp-menu-name'>{$item[0]}</div></a>";
 			}
 		}
 
@@ -265,9 +266,9 @@ function _wp_menu_output( $menu, $submenu, $submenu_as_parent = true ) {
 					}
 
 					$sub_item_url = esc_url( $sub_item_url );
-					echo "<li$class><a href='$sub_item_url'$class$aria_attributes>$title</a></li>";
+					echo "<li$class><a href='" . WP_Http::make_absolute_url( $sub_item_url, $admin_url ) . "'$class$aria_attributes>$title</a></li>";
 				} else {
-					echo "<li$class><a href='{$sub_item[2]}'$class$aria_attributes>$title</a></li>";
+					echo "<li$class><a href='" . WP_Http::make_absolute_url( $sub_item[2], $admin_url ) . "'$class$aria_attributes>$title</a></li>";
 				}
 			}
 			echo '</ul>';