diff --git a/types/lib/client-options.d.ts b/types/lib/client-options.d.ts
index a8cf962d6..f3bcbb066 100644
--- a/types/lib/client-options.d.ts
+++ b/types/lib/client-options.d.ts
@@ -149,9 +149,9 @@ export interface IClientPublishOptions {
    *  MQTT 5.0 properties object
    */
   properties?: {
-    payloadFormatIndicator?: number,
+    payloadFormatIndicator?: boolean,
     messageExpiryInterval?: number,
-    topicAlias?: string,
+    topicAlias?: number,
     responseTopic?: string,
     correlationData?: Buffer,
     userProperties?: UserProperties,