diff --git a/authcache.module b/authcache.module
index 5f5f2b8..dfae1c3 100644
--- a/authcache.module
+++ b/authcache.module
@@ -757,6 +757,7 @@ function authcache_authcache_info() {
 
   // Debug mode by user only
   if (!variable_get('authcache_debug_all', FALSE) && _authcache_debug_access()) {
+    $debug_users = implode(', ', variable_get('authcache_debug_users', array()));
     $authcache_info['debug_users'] = $debug_users;
   }