diff --git a/machines/fuuko/services/matrix/mautrix-whatsapp.nix b/machines/fuuko/services/matrix/mautrix-whatsapp.nix
index 2df32f7..d8c0e13 100644
--- a/machines/fuuko/services/matrix/mautrix-whatsapp.nix
+++ b/machines/fuuko/services/matrix/mautrix-whatsapp.nix
@@ -1,6 +1,15 @@
 # somewhat adapted from https://github.com/NixOS/nixpkgs/pull/59211
 { config, lib, pkgs, ... }:
 let
+  nixpkgsMa27 = import
+    (pkgs.fetchFromGitHub {
+      owner = "Ma27";
+      repo = "nixpkgs";
+      rev = "5c7156faf1c766166d663a68e666678992ca2b2a";
+      sha256 = "0jj9slwrpzxm88cqz7qy2v92828wsiqhrr32alix5mq7xhfyblg0";
+    })
+    { inherit (pkgs) system; };
+
   synapseCfg = config.services.matrix-synapse;
 in
 let
@@ -83,7 +92,7 @@ in
     serviceConfig = {
       DynamicUser = true;
       StateDirectory = "mautrix-whatsapp";
-      ExecStart = "${pkgs.mautrix-whatsapp}/bin/mautrix-whatsapp -c ${generatedConfig}/config.yaml";
+      ExecStart = "${nixpkgsMa27.mautrix-whatsapp}/bin/mautrix-whatsapp -c ${generatedConfig}/config.yaml";
       Restart = "on-failure";
     };
   };