diff --git a/extensions/discord/src/monitor/gateway-plugin.ts b/extensions/discord/src/monitor/gateway-plugin.ts
index 3d3e529c163..e5a644d7af8 100644
--- a/extensions/discord/src/monitor/gateway-plugin.ts
+++ b/extensions/discord/src/monitor/gateway-plugin.ts
@@ -248,6 +248,8 @@ function createGatewayPlugin(params: {
   };
 }): carbonGateway.GatewayPlugin {
   class SafeGatewayPlugin extends carbonGateway.GatewayPlugin {
+    declare private firstHeartbeatTimeout: ReturnType<typeof setTimeout> | undefined;
+
     private gatewayInfoUsedFallback = false;
 
     constructor() {