1 files changed, 2 insertions, 0 deletions

diff --git a/packages/base/src/Numeric/Chain.hs b/packages/base/src/Numeric/Chain.hs
index 4c497f0..443bd28 100644
--- a/packages/base/src/Numeric/Chain.hs
+++ b/packages/base/src/Numeric/Chain.hs
@@ -12,6 +12,8 @@
 --
 -----------------------------------------------------------------------------
 
+{-# LANGUAGE FlexibleContexts #-}
+
 module Numeric.Chain (
                       optimiseMult,
                      ) where