diff --git a/modules/matrix/mautrix-whatsapp.nix b/modules/matrix/mautrix-whatsapp.nix
index f771a010..126013c1 100644
--- a/modules/matrix/mautrix-whatsapp.nix
+++ b/modules/matrix/mautrix-whatsapp.nix
@@ -118,6 +118,10 @@ in
         User = "mautrix-whatsapp";
         Group = "matrix-synapse";
         EnvironmentFile = cfg.environmentFile;
+        ExecStart = ''
+          ${mautrix-whatsapp}/bin/mautrix-whatsapp \
+            --config='${settingsFile}'
+        '';
       };
       restartTriggers = [ cfg.environmentFile ];
     };