diff --git a/GHC/Err.lhs b/GHC/Err.lhs
index 7fb057c0..e9f1212d 100644
--- a/GHC/Err.lhs
+++ b/GHC/Err.lhs
@@ -24,6 +24,7 @@
 
 -- #hide
 module GHC.Err( absentErr, error, undefined ) where
+import GHC.CString ()
 import GHC.Types
 import GHC.Prim
 import GHC.Integer ()   -- Make sure Integer is compiled first