diff --git a/py.cpypy.sh b/py.cpypy.sh
index 884c2fe..6775efb 100755
--- a/py.cpypy.sh
+++ b/py.cpypy.sh
@@ -1,6 +1,8 @@
 #! /usr/bin/env sh
 
-root="/sw/python/cpypy"
+file="$(readlink --canonicalize-existing "${0}")"
+root="$(dirname "${file}")"
+root="${root}/root/py/cpypy"
 
 data="download-metadata.json"