diff --git a/src/runtime/haskell/PGF/TypeCheck.hs b/src/runtime/haskell/PGF/TypeCheck.hs
index 5db4ef439..c5cc44b4e 100644
--- a/src/runtime/haskell/PGF/TypeCheck.hs
+++ b/src/runtime/haskell/PGF/TypeCheck.hs
@@ -41,7 +41,7 @@ import Control.Applicative
 import Control.Monad
 --import Control.Monad.Identity
 import Control.Monad.State
-import Control.Monad.Error
+import Control.Monad.Except
 import Text.PrettyPrint
 
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