diff --git a/reactivity.cabal b/reactivity.cabal
--- a/reactivity.cabal
+++ b/reactivity.cabal
@@ -1,5 +1,5 @@
 Name:                reactivity
-Version:             0.3.2.0
+Version:             0.3.2.1
 Synopsis:            An alternate implementation of push-pull FRP.
 Category:            reactivity, FRP
 Description:         An alternate implementation of push-pull FRP. This is based on the Reactive package (http://haskell.org/haskellwiki/reactive) (and the sources have been made available in accordance with the GPL [license] of that package).
diff --git a/src/Control/CUtils/Conc.hs b/src/Control/CUtils/Conc.hs
--- a/src/Control/CUtils/Conc.hs
+++ b/src/Control/CUtils/Conc.hs
@@ -1,4 +1,4 @@
-{-# LANGUAGE Trustworthy, ScopedTypeVariables, DeriveDataTypeable, ImplicitParams #-}
+{-# LANGUAGE Trustworthy, ScopedTypeVariables, DeriveDataTypeable, ImplicitParams, FlexibleInstances #-}
 -- | A module of concurrent higher order functions.
 module Control.CUtils.Conc (ExceptionList(..), ConcException(..), assocFold, Concurrent(..), concF_, concF, conc_, conc, concP, progressConcF, oneOfF, oneOf) where