diff --git a/e107_core/templates/header_default.php b/e107_core/templates/header_default.php
index c233c7a4a..0eb43e1f8 100644
--- a/e107_core/templates/header_default.php
+++ b/e107_core/templates/header_default.php
@@ -194,7 +194,7 @@ if (/*!defined("PREVIEWTHEME") && */! (isset($no_core_css) && $no_core_css !==tr
 	$e_js->otherCSS('{e_WEB_CSS}e107.css');
 }
 
-if(THEME_LEGACY === true)
+if(THEME_LEGACY === true || !deftrue('BOOTSTRAP'))
 {
 	$e_js->otherCSS('{e_WEB_CSS}backcompat.css');
 }