diff --git a/.changeset/young-mayflies-sit.md b/.changeset/young-mayflies-sit.md
new file mode 100644
index 0000000000000..7964966e860df
--- /dev/null
+++ b/.changeset/young-mayflies-sit.md
@@ -0,0 +1,5 @@
+---
+'@mysten/sui.js': patch
+---
+
+Fix WebSocket constructor not being properly assigned in SuiClient HTTP transport
diff --git a/sdk/typescript/src/client/http-transport.ts b/sdk/typescript/src/client/http-transport.ts
index b04696a264f84..553c4a5a6cb44 100644
--- a/sdk/typescript/src/client/http-transport.ts
+++ b/sdk/typescript/src/client/http-transport.ts
@@ -76,7 +76,7 @@ export class SuiHTTPTransport implements SuiTransport {
 			this.#websocketClient = new WebsocketClient(
 				this.#options.websocket?.url ?? this.#options.url,
 				{
-					WebSocketConstructor: this.#options.WebSocketConstructor,
+					WebSocketConstructor,
 					...this.#options.websocket,
 				},
 			);