diff --git a/mwc-probability.cabal b/mwc-probability.cabal
--- a/mwc-probability.cabal
+++ b/mwc-probability.cabal
@@ -1,5 +1,5 @@
 name:                mwc-probability
-version:             1.2.0
+version:             1.2.1
 homepage:            http://github.com/jtobin/mwc-probability
 license:             MIT
 license-file:        LICENSE
diff --git a/src/System/Random/MWC/Probability.hs b/src/System/Random/MWC/Probability.hs
--- a/src/System/Random/MWC/Probability.hs
+++ b/src/System/Random/MWC/Probability.hs
@@ -1,4 +1,5 @@
 {-# LANGUAGE TypeFamilies #-}
+{-# LANGUAGE CPP #-}
 {-# OPTIONS_GHC -Wall #-}
 
 -- |
@@ -76,6 +77,9 @@
 import Control.Monad.Primitive
 import Control.Monad.IO.Class
 import Control.Monad.Trans.Class
+#if __GLASGOW_HASKELL__ < 710
+import Data.Foldable (Foldable)
+#endif
 import qualified Data.Foldable as F
 import Data.List (findIndex)
 import System.Random.MWC as MWC hiding (uniform, uniformR)