diff --git a/Propellor/Property/Dns.hs b/Propellor/Property/Dns.hs
index 9e12763..0813e61 100644
--- a/Propellor/Property/Dns.hs
+++ b/Propellor/Property/Dns.hs
@@ -8,6 +8,7 @@ module Propellor.Property.Dns (
 	nextSerialNumber,
 	adjustSerialNumber,
 	serialNumberOffset,
+	WarningMessage,
 	genZone,
 ) where