diff --git a/recipes-core/busybox/files/sysmocom-idu/simple.script b/recipes-core/busybox/files/sysmocom-idu/simple.script
index 3e304b9..cb9d3d4 100644
--- a/recipes-core/busybox/files/sysmocom-idu/simple.script
+++ b/recipes-core/busybox/files/sysmocom-idu/simple.script
@@ -44,7 +44,7 @@ case "$1" in
 		if [ -n "$router" ] ; then
 			if ! root_is_nfs ; then
                                 if [ $have_bin_ip -eq 1 ]; then
-                                        while ip route del default 2>/dev/null ; do
+                                        while ip route del default dev $interface 2>/dev/null ; do
                                                 :
                                         done
                                 else