diff --git a/nixos/modules/services/networking/firefox/sync-server.nix b/nixos/modules/services/networking/firefox/sync-server.nix
index 79f32f3358c..70d2d72ca8b 100644
--- a/nixos/modules/services/networking/firefox/sync-server.nix
+++ b/nixos/modules/services/networking/firefox/sync-server.nix
@@ -135,7 +135,7 @@ in
           echo >> ${cfg.privateConfig} "secret = $(head -c 20 /dev/urandom | sha1sum | tr -d ' -')"
         fi
       '';
-      serviceConfig.ExecStart = "paster serve ${syncServerIni}";
+      serviceConfig.ExecStart = "${pkgs.pythonPackages.pasteScript}/bin/paster serve ${syncServerIni}";
     };
 
   };