diff --git a/bsc/nix/upload.sh b/bsc/nix/upload.sh
new file mode 100755
index 0000000..00286e5
--- /dev/null
+++ b/bsc/nix/upload.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+
+# This post build hook sends the closure of the just built derivation to the
+# target machine. In our case this is the MareNostrum4 cluster.
+
+# set -e fails as the profile runs some erroring programs
+# We need the profile to load nix in the $PATH
+. /etc/profile
+
+set -eu
+set -f # disable globbing
+export IFS=' '
+nixroot=/gpfs/projects/bsc15/nix
+store=$nixroot/nix/store
+target=ssh://mn
+
+nix copy --to $target $OUT_PATHS