diff --git a/wp-admin/includes/class-wp-posts-list-table.php b/wp-admin/includes/class-wp-posts-list-table.php
index 4faf36e3eb..eebaa8522d 100644
--- a/wp-admin/includes/class-wp-posts-list-table.php
+++ b/wp-admin/includes/class-wp-posts-list-table.php
@@ -47,6 +47,14 @@ class WP_Posts_List_Table extends WP_List_Table {
 	function WP_Posts_List_Table() {
 		global $post_type_object, $post_type, $wpdb;
 
+		if ( !isset( $_REQUEST['post_type'] ) )
+			$post_type = 'post';
+		elseif ( in_array( $_REQUEST['post_type'], get_post_types( array( 'show_ui' => true ) ) ) )
+			$post_type = $_REQUEST['post_type'];
+		else
+			wp_die( __( 'Invalid post type' ) );
+		$_REQUEST['post_type'] = $post_type;
+
 		$post_type_object = get_post_type_object( $post_type );
 
 		if ( !current_user_can( $post_type_object->cap->edit_others_posts ) ) {