diff --git a/scripts/update-nix-files.sh b/scripts/update-nix-files.sh
index 33ecea25..bba5a451 100755
--- a/scripts/update-nix-files.sh
+++ b/scripts/update-nix-files.sh
@@ -38,8 +38,10 @@ write-package-shell-nix () {
 
 update-nix-files () {
     for s in ${SOURCES[@]} ; do
-        cd "$s" && cabal2nix . > default.nix
+        pushd "$s" > /dev/null
+        cabal2nix . > default.nix
         write-package-shell-nix $s
+        popd > /dev/null
     done
 }