diff --git a/api/@ohos.telephony.observer.d.ts b/api/@ohos.telephony.observer.d.ts
index 42c61b2619cece4efd48fb92d015646479bfdb44..ce3d8ea6bdb159e3aa131e267fedc31b9aac0102 100644
--- a/api/@ohos.telephony.observer.d.ts
+++ b/api/@ohos.telephony.observer.d.ts
@@ -411,7 +411,7 @@ declare namespace observer {
    * @since 11
    */
   function on(type: 'cellularDataConnectionStateChange', options: ObserverOptions,
-    callback: Callback<DataConnectionStateInfo>): void,
+    callback: Callback<DataConnectionStateInfo>): void;
 
   /**
    * Cancel callback when the cellular data link connection state is updated.