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-rw-r--r--src/Propellor/Types.hs1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/Propellor/Types.hs b/src/Propellor/Types.hs
index 2bddfc1a..5d6a37cc 100644
--- a/src/Propellor/Types.hs
+++ b/src/Propellor/Types.hs
@@ -6,6 +6,7 @@
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE PolyKinds #-}
{-# LANGUAGE DataKinds #-}
+{-# LANGUAGE DeriveDataTypeable #-}
module Propellor.Types
( Host(..)