diff --git a/ats-setup.cabal b/ats-setup.cabal
--- a/ats-setup.cabal
+++ b/ats-setup.cabal
@@ -1,5 +1,5 @@
 name:                ats-setup
-version:             0.1.0.4
+version:             0.1.0.5
 synopsis:            ATS scripts for Cabal builds
 description:         This package contains various scripts that go in a package's @Setup.hs@ to make building libraries with ATS dependencies easier.
 license:             BSD3
diff --git a/src/Distribution/ATS.hs b/src/Distribution/ATS.hs
--- a/src/Distribution/ATS.hs
+++ b/src/Distribution/ATS.hs
@@ -56,6 +56,7 @@
 
 atsContrib :: ATSVersion -> ATSDependency
 atsContrib v = ATSDependency ("ats2-postiats-" ++ vString ++ "-contrib") "ats-deps/contrib" ("https://downloads.sourceforge.net/project/ats2-lang/ats2-lang/ats2-postiats-" ++ vString ++ "/ATS2-Postiats-contrib-" ++ vString ++ ".tgz")
+    where vString = intercalate "." . fmap show $ v
 
 -- | GMP bindings for ATS
 libgmp :: ATSDependency