diff --git a/lib/setup.php b/lib/setup.php
index 98c62b90002..52f5ab58707 100644
--- a/lib/setup.php
+++ b/lib/setup.php
@@ -75,6 +75,7 @@ global $HTTPSPAGEREQUIRED;
 
 
     if (!isset($CFG->wwwroot)) {
+        trigger_error('Fatal: $CFG->wwwroot is not configured! Exiting.');
         die;
     }