diff --git a/src/client.ts b/src/client.ts
index 69b4eaab2..81fb47ebb 100644
--- a/src/client.ts
+++ b/src/client.ts
@@ -2385,7 +2385,7 @@ export class StreamChat<
       headers: {
         Authorization: token,
         'stream-auth-type': this.getAuthType(),
-        'x-stream-client': this.getUserAgent(),
+        'X-Stream-Client': this.getUserAgent(),
         ...options.headers,
       },
       ...options.config,
diff --git a/src/connection.ts b/src/connection.ts
index 9ae7232ee..a624b9cbb 100644
--- a/src/connection.ts
+++ b/src/connection.ts
@@ -211,7 +211,7 @@ export class StableWSConnection<
     };
     const qs = encodeURIComponent(JSON.stringify(params));
     const token = this.tokenManager.getToken();
-    return `${this.wsBaseURL}/connect?json=${qs}&api_key=${this.apiKey}&authorization=${token}&stream-auth-type=${this.authType}&x-stream-client=${this.userAgent}`;
+    return `${this.wsBaseURL}/connect?json=${qs}&api_key=${this.apiKey}&authorization=${token}&stream-auth-type=${this.authType}&X-Stream-Client=${this.userAgent}`;
   };
 
   /**