diff --git a/run-tests.php b/run-tests.php
index f52c41c4792e3..59515cbb4c8bc 100755
--- a/run-tests.php
+++ b/run-tests.php
@@ -72,10 +72,7 @@
 set_time_limit(0);
 
 // delete as much output buffers as possible
-$ob = ob_get_level();
-if ($ob) do {
-	@ob_end_clean();
-} while(($ob > 1) && ($ob-- > ob_get_level()));
+while(@ob_end_clean());
 if (ob_get_level()) echo "Not all buffers were deleted.\n";
 
 error_reporting(E_ALL);