diff --git a/nixos/modules/services/matrix/lk-jwt-service.nix b/nixos/modules/services/matrix/lk-jwt-service.nix
index 2be1fe806d5c..6adc0465e9df 100644
--- a/nixos/modules/services/matrix/lk-jwt-service.nix
+++ b/nixos/modules/services/matrix/lk-jwt-service.nix
@@ -50,7 +50,7 @@ in
       after = [ "network-online.target" ];
       environment = {
         LIVEKIT_URL = cfg.livekitUrl;
-        LIVEKIT_JWT_PORT = toString cfg.port;
+        LIVEKIT_JWT_BIND = ":${toString cfg.port}";
         LIVEKIT_KEY_FILE = "/run/credentials/lk-jwt-service.service/livekit-secrets";
       };