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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 e10e0f5b..7052bf92 100644
--- a/src/Propellor/Types.hs
+++ b/src/Propellor/Types.hs
@@ -1,5 +1,6 @@
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
{-# LANGUAGE FlexibleInstances #-}
+{-# LANGUAGE UndecidableInstances #-}
{-# LANGUAGE FlexibleContexts #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE TypeFamilies #-}