diff --git a/network/iptables/iptables.conf b/network/iptables/iptables.conf
index 5134d5999..f7ca4fe66 100644
--- a/network/iptables/iptables.conf
+++ b/network/iptables/iptables.conf
@@ -14,6 +14,8 @@
 # GNU General Public License can be found in the file COPYING.
 # --- SDE-COPYRIGHT-NOTE-END ---
 
+var_append confopt ' ' "--with-ksource=$root/usr/src/linux"
+
 if [ "$SDECFG_PKG_IPTABLES_DEVEL" != 0 ] ; then
 	var_append confopt ' ' "--enable-devel"
 	var_append confopt ' ' "--enable-libipq"