diff --git a/test/MemoTest.hs b/test/MemoTest.hs
index 730d93f..cff2207 100644
--- a/test/MemoTest.hs
+++ b/test/MemoTest.hs
@@ -1,4 +1,5 @@
 {-# LANGUAGE FlexibleInstances #-}
+{-# LANGUAGE FlexibleContexts  #-}
 
 module MemoTest
 (