diff --git a/libraries/hpc b/libraries/hpc
index da5928ccf4e369f6985ef291351d074918b88019..315b78ac8fe7b42912d2146783b0366f6b0e9503 160000
--- a/libraries/hpc
+++ b/libraries/hpc
@@ -1 +1 @@
-Subproject commit da5928ccf4e369f6985ef291351d074918b88019
+Subproject commit 315b78ac8fe7b42912d2146783b0366f6b0e9503
diff --git a/utils/hpc/HpcMarkup.hs b/utils/hpc/HpcMarkup.hs
index 31327fc991477b5f4b6c931ab5c402bed77a3319..fb68eacef7624e1e4609de1fd2cea08041915601 100644
--- a/utils/hpc/HpcMarkup.hs
+++ b/utils/hpc/HpcMarkup.hs
@@ -479,15 +479,12 @@ instance Monoid ModuleSummary where
 
 writeFileUsing :: String -> String -> IO ()
 writeFileUsing filename text = do
-  let dest_dir = dropWhileEndLE (\ x -> x /= '/') $ filename
-
 -- We need to check for the dest_dir each time, because we use sub-dirs for
 -- packages, and a single .tix file might contain information about
 -- many package.
 
   -- create the dest_dir if needed
-  when (not (null dest_dir)) $
-    createDirectoryIfMissing True dest_dir
+  createDirectoryIfMissing True (takeDirectory filename)
 
   writeFile filename text