diff --git a/src/wp-admin/includes/plugin.php b/src/wp-admin/includes/plugin.php
index 7834abe6f2..3053971e48 100644
--- a/src/wp-admin/includes/plugin.php
+++ b/src/wp-admin/includes/plugin.php
@@ -1454,6 +1454,7 @@ function add_submenu_page( $parent_slug, $page_title, $menu_title, $capability,
 			// For negative or `0` positions, prepend the submenu.
 			array_unshift( $submenu[ $parent_slug ], $new_sub_menu );
 		} else {
+			$position = absint( $position );
 			// Grab all of the items before the insertion point.
 			$before_items = array_slice( $submenu[ $parent_slug ], 0, $position, true );
 			// Grab all of the items after the insertion point.