diff --git a/bgpwtf/machines/modules/gretap.nix b/bgpwtf/machines/modules/gretap.nix
index 7d3d847a..f4e1a7b2 100644
--- a/bgpwtf/machines/modules/gretap.nix
+++ b/bgpwtf/machines/modules/gretap.nix
@@ -56,7 +56,7 @@ in {
     ];
     serviceConfig = {
       Type = "oneshot";
-      ExecStart = "${pkgs.iproute2}/bin/ip link add name ${name} type gretap remote ${value.remoteV4} local ${value.localV4} key ${toString value.id}";
+      ExecStart = "${pkgs.iproute}/bin/ip link add name ${name} type gretap remote ${value.remoteV4} local ${value.localV4} key ${toString value.id}";
     };
   }) cfg.interfaces;
 }
diff --git a/bgpwtf/machines/tests/edge01-waw.nix b/bgpwtf/machines/tests/edge01-waw.nix
index 6b641b56..0a1e2601 100644
--- a/bgpwtf/machines/tests/edge01-waw.nix
+++ b/bgpwtf/machines/tests/edge01-waw.nix
@@ -19,9 +19,16 @@
 #  nix-build -A bgpwtf.machines.tests.edge01-waw.driver && result/bin/nixos-test-driver
 #  >>> start_all()
 
-{ hscloud, pkgsSrc, pkgs, lib, ... }:
+{ hscloud,  ... }:
 
-with lib;
+# Use pkgs that edge01 is using. Perhaps we shouldn't use them for
+# _everything_, but this will have to do.
+let
+  pkgs = hscloud.ops.machines."edge01.waw.bgp.wtf".pkgs;
+  pkgsSrc = pkgs.path;
+  lib = pkgs.lib;
+
+in with lib;
 
 let
 
@@ -262,7 +269,7 @@ test = import "${pkgsSrc}/nixos/tests/make-test-python.nix" ({ pkgs, libs, ... }
     # edge01 must announce exactly one v4 prefix.
     bgpspeaker.succeed("birdc show route protocol bgp_globalmix_v4 | grep unicast")
     bgpspeaker.fail(
-        "birdc show route protocol bgp_globalmix_v4 | grep unicast | grep -v 185.236.240.0/24"
+        "birdc show route protocol bgp_globalmix_v4 | grep unicast | grep -v 185.236.240.0/23"
     )
 
     # edge01 must announce exactly one v6 prefix.