diff --git a/hosts/fw.cloonar.com/modules/openconnect.nix b/hosts/fw.cloonar.com/modules/openconnect.nix
index 722f09a..0c7477f 100644
--- a/hosts/fw.cloonar.com/modules/openconnect.nix
+++ b/hosts/fw.cloonar.com/modules/openconnect.nix
@@ -6,7 +6,7 @@ let
       outputHashMode = "recursive";
       outputHashAlgo = "sha256";
       outputHash = sha256;
-      builder = writeShellScript "vpnc-script.sh" ''
+      builder = pkgs.writeShellScript "vpnc-script.sh" ''
         #!/bin/sh
         export INTERNAL_IP4_DNS=