diff --git a/modules/c3d2.nix b/modules/c3d2.nix
index 64498368..3140cec3 100644
--- a/modules/c3d2.nix
+++ b/modules/c3d2.nix
@@ -220,6 +220,7 @@ in
             # port = 8883;
             user = "SECRET[mqtt.user]";
             password = "SECRET[mqtt.password]";
+            client_id = "vector-${config.networking.hostName}";
             encoding.codec = "json";
             topic = "journal/{{ host }}/{{ _SYSTEMD_UNIT }}/{{ PRIORITY }}";
             # tls.enabled = true;