diff --git a/wiki.pl b/wiki.pl
index 33d7c060..057e78c9 100755
--- a/wiki.pl
+++ b/wiki.pl
@@ -2377,7 +2377,7 @@ sub GetCss {      # prevent javascript injection
   if ($IndexHash{$StyleSheetPage} and not @css) {
     push (@css, "$ScriptName?action=browse;id=" . UrlEncode($StyleSheetPage) . ";raw=1;mime-type=text/css")
   }
-  push (@css, 'http://www.oddmuse.org/default.css') unless @css;
+  push (@css, 'https://www.oddmuse.org/default.css') unless @css;
   return join('', map { qq(<link type="text/css" rel="stylesheet" href="$_" />) } @css);
 }