diff --git a/Language/Haskell/GhcMod/Monad.hs b/Language/Haskell/GhcMod/Monad.hs
index 53192dc..a23a411 100644
--- a/Language/Haskell/GhcMod/Monad.hs
+++ b/Language/Haskell/GhcMod/Monad.hs
@@ -15,6 +15,7 @@ module Language.Haskell.GhcMod.Monad (
   , defaultState
   , CompilerMode(..)
   , GhcModLog
+  , GhcModError(..)
   -- * Monad utilities
   , runGhcModT
   , runGhcModT'