diff --git a/manifests/init.pp b/manifests/init.pp
index 97936c7..37de707 100644
--- a/manifests/init.pp
+++ b/manifests/init.pp
@@ -69,8 +69,12 @@ define wmdeit_backup::scpbackup (
 
 	$tdir = "$backup_dir/$dir/daily.0"
 
+	exec {"pubkey":
+		command => "/usr/bin/openssl rsa -in $backup_key_file -pubout -out $backup_pub_key_file",
+	}
 
 	file {"$shellscript":
+		require => Exec["pubkey"],
 		mode => "700",
 		ensure => file,
 		content => "#!/bin/sh