diff --git a/build_iwd.sh b/build_iwd.sh
index ba5b77b..6dbc5e8 100755
--- a/build_iwd.sh
+++ b/build_iwd.sh
@@ -1,4 +1,5 @@
-if [ -z "${WORKSPACE}"]; then
+#!/bin/sh
+if [ -z "${WORKSPACE}" ]; then
 	export WORKSPACE="$(pwd)"
 fi