diff --git a/lib/common.lib.php b/lib/common.lib.php
index 1d6223814..94a071945 100644
--- a/lib/common.lib.php
+++ b/lib/common.lib.php
@@ -655,7 +655,7 @@ function html_purifier($html)
     if ((function_exists('check_html_link_nofollow') && check_html_link_nofollow('html_purifier'))) {
         $config->set('HTML.Nofollow', true); // rel=nofollow 으로 스팸유입을 줄임
     }
-    $config->set('URI.SafeIframeRegexp', '%^(https?:)?//(' . $safeiframe . ')%');
+    $config->set('URI.SafeIframeRegexp', '%^(https?:)?//(' . preg_replace('/\\\?\./', '\.', $safeiframe) . ')%');
     $config->set('Attr.AllowedFrameTargets', array('_blank'));
     //유튜브, 비메오 전체화면 가능하게 하기
     $config->set('Filter.Custom', array(new HTMLPurifier_Filter_Iframevideo()));