diff --git a/nixos/tests/libreswan.nix b/nixos/tests/libreswan.nix
index 6dd9a845d19a..1a25c1e6d9af 100644
--- a/nixos/tests/libreswan.nix
+++ b/nixos/tests/libreswan.nix
@@ -37,6 +37,8 @@ let
     useDHCP = false;
     interfaces.eth1.ipv4.addresses = lib.mkVMOverride [];
     interfaces.eth2.ipv4.addresses = lib.mkVMOverride [];
+    interfaces.eth1.ipv6.addresses = lib.mkVMOverride [];
+    interfaces.eth2.ipv6.addresses = lib.mkVMOverride [];
     # open a port for testing
     firewall.allowedUDPPorts = [ 1234 ];
   };