diff --git a/interfaces/kits/ani/zlib/ets/@ohos.zlib.ets b/interfaces/kits/ani/zlib/ets/@ohos.zlib.ets
index 7014d3230513b328298b4d4a5a9ef3ab433ff0f1..29be995e61a71c9041d02f8c1ce7e81e1d6be8b4 100644
--- a/interfaces/kits/ani/zlib/ets/@ohos.zlib.ets
+++ b/interfaces/kits/ani/zlib/ets/@ohos.zlib.ets
@@ -758,7 +758,7 @@ export default namespace zlib {
     }
 
     public gzwrite(buf: ArrayBuffer, len: long): Promise<long> {
-      if (buf.byteLength == 0 || len > (buf.byteLength as long)) {
+      if (buf.byteLength == 0 || len > (buf.byteLength.toLong())) {
         throw createBusinessError(ERROR_PARAM_CHECK_ERROR, PARAM_CHECK_FAILED);
       }
       let p: Promise<long> = new Promise<long>((resolve: (v:long) => void, reject: (error: BusinessError) => void) : void => {