diff --git a/test/test-network/conf/25-veth-router-captive.network b/test/test-network/conf/25-veth-router-captive.network
index 21259a3e1d..7d8afc8d59 100644
--- a/test/test-network/conf/25-veth-router-captive.network
+++ b/test/test-network/conf/25-veth-router-captive.network
@@ -5,3 +5,4 @@ Name=router-captive
 [Network]
 IPv6AcceptRA=no
 IPv6SendRA=no
+IPv6Forwarding=yes