diff --git a/exercises/Mooc/LimitedPrelude.hs b/exercises/Mooc/LimitedPrelude.hs
index cceb8fe..28b4792 100644
--- a/exercises/Mooc/LimitedPrelude.hs
+++ b/exercises/Mooc/LimitedPrelude.hs
@@ -1 +1 @@
-module Mooc.LimitedPrelude (Int,Integer,Bool(..),Ordering(..),Eq(..),Ord(..),Num(..),Maybe(..),otherwise,undefined)  where
+module Mooc.LimitedPrelude (Int,Integer,Bool(..),Ordering(..),Eq(..),Ord(..),Num(..),Integral(..),Maybe(..),otherwise,undefined)  where
diff --git a/exercises/Set3bTest.hs b/exercises/Set3bTest.hs
index 7db4fac..ac8181c 100644
--- a/exercises/Set3bTest.hs
+++ b/exercises/Set3bTest.hs
@@ -26,7 +26,7 @@ tests = [(1,"buildList",[imports, ex1_buildList])
 
 -- -- -- -- -- --
 
-imports = $(importsOnly "Set3b" ["GHC.Num", "GHC.Base", "GHC.Classes", "GHC.Types",
+imports = $(importsOnly "Set3b" ["GHC.Num", "GHC.Real", "GHC.Base", "GHC.Classes", "GHC.Types",
                                  "Mooc.Todo", "Mooc.LimitedPrelude"])
 
 ex1_buildList = property $ do