diff --git a/code/GridFieldBulkImageUpload_Request.php b/code/GridFieldBulkImageUpload_Request.php
index 20af9ae..e1722ce 100644
--- a/code/GridFieldBulkImageUpload_Request.php
+++ b/code/GridFieldBulkImageUpload_Request.php
@@ -40,7 +40,7 @@ class GridFieldBulkImageUpload_Request extends RequestHandler {
 	/**
 	 *
 	 */
-	static $url_handlers = array(
+	private static $url_handlers = array(
 		'$Action!' => '$Action'
 	);
 	
@@ -430,4 +430,4 @@ class GridFieldBulkImageUpload_Request extends RequestHandler {
 			)));
 		return $items;
 	}
-}
\ No newline at end of file
+}