diff --git a/src/Base.hs b/src/Base.hs
index 4eb78145f..db95965ed 100644
--- a/src/Base.hs
+++ b/src/Base.hs
@@ -29,6 +29,7 @@ import GHC.Float as X (
     Float(..)
   , Double(..)
   , Floating (..)
+  , RealFloat(..)
   , showFloat
   , showSignedFloat
   )