diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,8 +1,8 @@
 # shake-ats
 
-## 1.10.2.3
+## 1.10.3.0
 
-  * `cleanATS` is now more precise
+  * Don't copy files to `$PATSHOME`
 
 ## 1.10.2.2
 
diff --git a/shake-ats.cabal b/shake-ats.cabal
--- a/shake-ats.cabal
+++ b/shake-ats.cabal
@@ -1,6 +1,6 @@
 cabal-version:   1.18
 name:            shake-ats
-version:         1.10.2.3
+version:         1.10.3.0
 license:         BSD3
 license-file:    LICENSE
 copyright:       Copyright: (c) 2018-2019 Vanessa McHale
diff --git a/src/Development/Shake/ATS.hs b/src/Development/Shake/ATS.hs
--- a/src/Development/Shake/ATS.hs
+++ b/src/Development/Shake/ATS.hs
@@ -49,7 +49,7 @@
 import           Development.Shake.FilePath
 import           Development.Shake.Version
 import           Language.ATS
-import           System.Directory                  (createDirectoryIfMissing, doesFileExist)
+import           System.Directory                  (doesFileExist)
 import           System.Environment                (getEnv)
 import           System.Exit                       (ExitCode (ExitSuccess))
 
@@ -90,14 +90,6 @@
 gcFlag False = "-DATS_MEMALLOC_LIBC"
 gcFlag True  = "-DATS_MEMALLOC_GCBDW"
 
--- Copy source files to the appropriate place. This is necessary because
--- @#include@s in ATS are weird.
-copySources :: ATSToolConfig -> [FilePath] -> Action ()
-copySources ATSToolConfig{..} sources =
-    forM_ sources $ \dep -> do
-        liftIO $ createDirectoryIfMissing True (_patsHome </> takeDirectory dep)
-        copyFile' dep (_patsHome </> dep)
-
 makeCFlags :: [String] -- ^ Inputs
            -> [ForeignCabal] -- ^ Haskell libraries
            -> String -- ^ GHC version
@@ -216,12 +208,10 @@
 cgen toolConfig' extras atsGens atsSrc cFiles =
     cFiles %> \out -> do
 
-        -- tell shake which files to track and copy them to the appropriate
-        -- directory
+        -- tell shake which files to track
         need extras
         sources <- transitiveDeps atsGens [atsSrc]
         need sources
-        copySources toolConfig' sources
 
         atsCommand toolConfig' atsSrc out
 
diff --git a/src/Development/Shake/ATS/Rules.hs b/src/Development/Shake/ATS/Rules.hs
--- a/src/Development/Shake/ATS/Rules.hs
+++ b/src/Development/Shake/ATS/Rules.hs
@@ -102,4 +102,4 @@
 cleanATS =
     zipWithM_ removeFilesAfter
         [".", ".atspkg", "ats-deps"]
-        [["//*_dats.c", "//*_sats.c", "//*_lats.dats", "//tags"], ["//*"], ["//*"]]
+        [["//*.c", "//*_lats.dats", "//tags"], ["//*"], ["//*"]]