diff --git a/interfaces/kits/js/src/mod_fs/class_watcher/fs_file_watcher.cpp b/interfaces/kits/js/src/mod_fs/class_watcher/fs_file_watcher.cpp
index 9ac8925873108e1e170ae1920746628e43084957..4b7f9f82c9888c70f3c5475a2891121027453592 100644
--- a/interfaces/kits/js/src/mod_fs/class_watcher/fs_file_watcher.cpp
+++ b/interfaces/kits/js/src/mod_fs/class_watcher/fs_file_watcher.cpp
@@ -204,8 +204,6 @@ void FsFileWatcher::ReadNotifyEvent()
     } while (len < 0);
 
     while (len > 0 && index < len) {
-        event = reinterpret_cast<inotify_event *>(buf + index);
-
         // Incomplete data: remaining bytes less than event struct size
         if ((len - index) < eventSize) {
             HILOGE(
@@ -213,6 +211,8 @@ void FsFileWatcher::ReadNotifyEvent()
             break;
         }
 
+        event = reinterpret_cast<inotify_event *>(buf + index);
+
         // Incomplete data: remaining bytes less than (event struct size + event->len)
         if (event->len > len - index - eventSize) {
             HILOGE("Out of bounds access, index: %{public}u, inotify: %{public}u, event :%{public}u, len: %{public}d",