diff --git a/nixos/modules/services/networking/privoxy.nix b/nixos/modules/services/networking/privoxy.nix
index 8ab9a6171fc7..b8d339163425 100644
--- a/nixos/modules/services/networking/privoxy.nix
+++ b/nixos/modules/services/networking/privoxy.nix
@@ -221,6 +221,8 @@ in
 
     services.privoxy.settings = {
       user-manual = "${pkgs.privoxy}/share/doc/privoxy/user-manual";
+      # This is needed for external filters
+      temporary-directory = "/tmp";
       filterfile = [ "default.filter" ];
       actionsfile =
         [ "match-all.action"