diff --git a/hadrian/src/Hadrian/Haskell/Cabal.hs b/hadrian/src/Hadrian/Haskell/Cabal.hs
index 1220e6bbe426c5bd2a99763b735edb5150695208..db20e470076a0462f34504b51354058112a1acb0 100644
--- a/hadrian/src/Hadrian/Haskell/Cabal.hs
+++ b/hadrian/src/Hadrian/Haskell/Cabal.hs
@@ -75,5 +75,6 @@ cabalOsString :: String -> String
 cabalOsString "mingw32"  = "windows"
 cabalOsString "darwin"   = "osx"
 cabalOsString "solaris2" = "solaris"
+cabalOsString "gnu"      = "hurd"
 cabalOsString other      = other