diff --git a/main/inc/lib/formvalidator/FormValidator.class.php b/main/inc/lib/formvalidator/FormValidator.class.php
index a84c02adbd..056b0e6e57 100644
--- a/main/inc/lib/formvalidator/FormValidator.class.php
+++ b/main/inc/lib/formvalidator/FormValidator.class.php
@@ -226,7 +226,7 @@ EOT;
 	 */
 	function add_real_progress_bar($upload_id, $delay=2)
 	{
-		if(function_exists('uploadprogress_get_info'))
+		if(!function_exists('uploadprogress_get_info'))
 		{
 			$this -> add_progress_bar($delay);
 			return;