diff -u b/core/includes/unicode.inc b/core/includes/unicode.inc
--- b/core/includes/unicode.inc
+++ b/core/includes/unicode.inc
@@ -22,7 +22,7 @@
     Unicode::STATUS_ERROR => REQUIREMENT_ERROR,
   );
   $unicode = new Unicode();
-  $unicode->check();
+  $failed_check = $unicode->check();
   $library = Unicode::getStatus();
 
   $requirements['unicode'] = array(