diff --git a/modules/rhizomatica_base_system/manifests/init.pp b/modules/rhizomatica_base_system/manifests/init.pp
index 84ecace..67d5206 100644
--- a/modules/rhizomatica_base_system/manifests/init.pp
+++ b/modules/rhizomatica_base_system/manifests/init.pp
@@ -88,6 +88,7 @@ class rhizomatica_base_system {
     }
 
   exec { 'update-grub':
+      command     => '/usr/sbin/update-grub',
       refreshonly => true,
     }