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:             0.1.0.0
+version:             0.1.0.1
 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
@@ -65,7 +65,7 @@
 -- | ATS prelude
 atsPrelude :: ATSVersion -> ATSDependency
 atsPrelude v = ATSDependency ("ats2-postiats-" ++ vString ++ "-prelude") "ats-deps/prelude" ("https://downloads.sourceforge.net/project/ats2-lang/ats2-lang/ats2-postiats-" ++ vString ++ "/ATS2-Postiats-include-" ++ vString ++ ".tgz")
-    where vString = intercalate "," . fmap show $ v
+    where vString = intercalate "." . fmap show $ v
 
 fetchDependencies :: [ATSDependency] -> IO ()
 fetchDependencies = (>> stopGlobalPool) . parallel_ . fmap fetchDependency