diff --git a/client/src/client.ts b/client/src/client.ts
index d131a59..b6a5850 100644
--- a/client/src/client.ts
+++ b/client/src/client.ts
@@ -23,7 +23,7 @@ export class WebSocketClient {
   private socket: Socket | null = null
   private config: Required<WebSocketClientConfig>
   private reconnectAttempt = 0
-  private reconnectTimer: NodeJS.Timeout | null = null
+  private reconnectTimer: ReturnType<typeof setTimeout> | null = null
   private connectionError: Error | null = null
   private isConnecting = false
 
diff --git a/client/src/namespaces/BroadcastNamespace.ts b/client/src/namespaces/BroadcastNamespace.ts
index b18e621..9710ae9 100644
--- a/client/src/namespaces/BroadcastNamespace.ts
+++ b/client/src/namespaces/BroadcastNamespace.ts
@@ -21,7 +21,7 @@ export class BroadcastNamespace {
   private socket: Socket | null = null
   private config: Required<NamespaceConfig>
   private reconnectAttempt = 0
-  private reconnectTimer: NodeJS.Timeout | null = null
+  private reconnectTimer: ReturnType<typeof setTimeout> | null = null
 
   constructor(config: Omit<NamespaceConfig, 'namespace'>) {
     this.config = {
diff --git a/client/src/namespaces/ChatNamespace.ts b/client/src/namespaces/ChatNamespace.ts
index dbf694b..6132412 100644
--- a/client/src/namespaces/ChatNamespace.ts
+++ b/client/src/namespaces/ChatNamespace.ts
@@ -21,7 +21,7 @@ export class ChatNamespace {
   private socket: Socket | null = null
   private config: Required<NamespaceConfig>
   private reconnectAttempt = 0
-  private reconnectTimer: NodeJS.Timeout | null = null
+  private reconnectTimer: ReturnType<typeof setTimeout> | null = null
 
   constructor(config: Omit<NamespaceConfig, 'namespace'>) {
     this.config = {