diff --git a/vmware/manifests/guest.pp b/vmware/manifests/guest.pp
index 98b1527..f5b901c 100644
--- a/vmware/manifests/guest.pp
+++ b/vmware/manifests/guest.pp
@@ -23,10 +23,10 @@ class vmware::guest::centos {
 	ensure => installed,
     }
     exec { "vmware-config-tools.pl":
-	command     => "unset DISPLAY REMOTEHOST SSH_CONNECTION ; perl /usr/bin/vmware-config-tools.pl -d",
+	command     => "/bin/sh -c 'unset DISPLAY REMOTEHOST SSH_CONNECTION ; perl /usr/bin/vmware-config-tools.pl -d'",
 	path        => "/bin:/usr/bin:/sbin:/usr/sbin",
 	environment => [ "PAGER=/bin/cat", ],
-	unless      => "test -f /lib/modules/$kernelrelease/misc/vmci.ko",
+	creates     => "/lib/modules/$kernelrelease/misc/vmci.ko",
 	require     => Package["VMwareTools"],
     }
     service { "vmware-tools":