diff --git a/manifests/init.pp b/manifests/init.pp
index e4b735d..cde6b25 100644
--- a/manifests/init.pp
+++ b/manifests/init.pp
@@ -36,7 +36,7 @@
     domain         => String,
     selector       => String,
     publickey      => String,
-    privatekey     => String,
+    privatekey     => Variant[String,Deferred],
     signingdomains => Array[String],
   }]]                       $keys                 = $opendkim::params::keys,