diff --git a/wp-admin/includes/list-table.php b/wp-admin/includes/list-table.php
index 3fb4aea102..bd0f2c8982 100644
--- a/wp-admin/includes/list-table.php
+++ b/wp-admin/includes/list-table.php
@@ -81,7 +81,7 @@ class WP_List_Table {
 		if ( is_string( $this->_screen ) )
 			$this->_screen = convert_to_screen( $this->_screen );
 
-		add_filter( 'manage_' . $this->_screen->id . '_columns', array( $this, 'get_columns' ) );
+		add_filter( 'manage_' . $this->_screen->id . '_columns', array( $this, 'get_columns' ), 0 );
 
 		if ( !$args['plural'] )
 			$args['plural'] = $this->_screen->base;
diff --git a/wp-admin/includes/template.php b/wp-admin/includes/template.php
index cd56356313..7a55aa95e4 100644
--- a/wp-admin/includes/template.php
+++ b/wp-admin/includes/template.php
@@ -234,7 +234,7 @@ function get_column_headers( $screen ) {
 	global $_wp_column_headers;
 
 	if ( !isset( $_wp_column_headers[ $screen->id ] ) ) {
-		$_wp_column_headers[ $screen->id ] = apply_filters( 'manage_' . $screen->id . '_columns', $_wp_column_headers );
+		$_wp_column_headers[ $screen->id ] = apply_filters( 'manage_' . $screen->id . '_columns', array() );
 	}
 
 	return $_wp_column_headers[ $screen->id ];