diff --git a/installer/InstallAuth.pm b/installer/InstallAuth.pm
index a86681565d..0015a14e2d 100644
--- a/installer/InstallAuth.pm
+++ b/installer/InstallAuth.pm
@@ -394,8 +394,11 @@ sub checkauth {
         -HttpOnly => 1,
         -expires => ''
     );
-
-    output_html_with_http_headers $query, $cookie, $template->output;
+    print $query->header(
+        -type    => 'text/html; charset=utf-8',
+        -cookie  => $cookie
+      ),
+      $template->output;
     exit;
 }