diff --git a/incremental/compat/src/arkts/observable.ts b/incremental/compat/src/arkts/observable.ts
index b670b11bf51ac100d8d2eb8a829ea14d8fe7de53..33bbf2d47bf032310490b985fb6818e30b625dca 100644
--- a/incremental/compat/src/arkts/observable.ts
+++ b/incremental/compat/src/arkts/observable.ts
@@ -433,12 +433,12 @@ class ObservableArray<T> extends Array<T> {
         return super.filter(predicate)
     }
 
-    override flat<U>(depth: int): Array<U> {
+    override flat(depth: int): Array<Any> {
         this.handler?.onAccess()
-        return super.flat<U>(depth)
+        return super.flat(depth)
     }
 
-    override flatMap<U>(fn: (v: T, k: number, arr: Array<T>) => U): Array<U> {
+    override flatMap<U>(fn: (v: T, k: number, arr: Array<T>) => U): Array<Any> {
         this.handler?.onAccess()
         return super.flatMap<U>(fn)
     }