diff --git a/web.php b/web.php
index 30657082..5e955b51 100644
--- a/web.php
+++ b/web.php
@@ -440,7 +440,7 @@ function engine($arg='curl') {
 		foreach ($flags as $key=>$val)
 			if ($val)
 				return $this->wrapper=$key;
-		user_error(E_Request,E_USER_ERROR);
+		user_error(self::E_Request,E_USER_ERROR);
 	}
 
 	/**