diff --git a/src/client-library/deriv-api-client.ts b/src/client-library/deriv-api-client.ts
index ad4bf51..f666c08 100644
--- a/src/client-library/deriv-api-client.ts
+++ b/src/client-library/deriv-api-client.ts
@@ -274,12 +274,12 @@ export class DerivAPIClient {
         await this.reinitializeData(this.subscribeHandler, this.authorizePayload);
     }
 
-    isSocketClosingOrClosed() {
-        return ![2, 3].includes(this.websocket.readyState);
+    isSocketReady() {
+        return this.websocket.readyState === WebSocket.OPEN; // 1
     }
 
     disconnect() {
-        if (!this.isSocketClosingOrClosed()) {
+        if (this.isSocketReady()) {
             this.websocket.close();
         }
     }