Index: wp-admin/includes/class-wp-list-table.php
===================================================================
--- wp-admin/includes/class-wp-list-table.php	(revision 16297)
+++ wp-admin/includes/class-wp-list-table.php	(working copy)
@@ -539,7 +539,7 @@
 		if ( !isset( $this->_column_headers ) ) {
 			$screen = get_current_screen();
 
-			$columns = get_column_headers( $screen );
+			$columns = apply_filters( 'manage_' . $screen->id . '_columns', $this->get_columns() );
 			$hidden = get_hidden_columns( $screen );
 			$sortable = apply_filters( "manage_{$screen->id}_sortable_columns", $this->get_sortable_columns() );