--- a/src/knocker_user.c
+++ b/src/knocker_user.c
@@ -82,7 +82,7 @@
       _dir_create (user->dir);
     }
 
-  if (knocker_user_is_root)
+  if (knocker_user_is_root())
     user->super = 1;
   else
     user->super = 0;