diff --git a/manifests/defaults.pp b/manifests/defaults.pp
index 18c6976..8336c96 100644
--- a/manifests/defaults.pp
+++ b/manifests/defaults.pp
@@ -13,6 +13,9 @@ class bind::defaults (
     $nsupdate_package       = undef,
     $managed_keys_directory = undef,
 ) {
+    unless is_bool($supported) {
+        fail('Please ensure that the dependencies of the bind module are installed and working correctly')
+    }
     unless $supported {
         fail('Platform is not supported')
     }