diff --git a/install_modules_unit.sh b/install_modules_unit.sh
new file mode 100755
index 000000000..3a2c06e6e
--- /dev/null
+++ b/install_modules_unit.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+#
+# This script is used by Puppet OpenStack modules to prepare
+# modules before running dependencies.
+#
+
+set -ex
+
+if [ ! -z ${GEM_HOME} ]; then
+    GEM_BIN_DIR=${GEM_HOME}/bin/
+fi
+
+export SCRIPT_DIR=$(readlink -f "$(dirname $0)")
+export PUPPETFILE_DIR=${PUPPETFILE_DIR:-/etc/puppet/modules}
+source $SCRIPT_DIR/functions
+
+install_modules