diff --git a/src/layui/layui/layDialogs.h b/src/layui/layui/layDialogs.h
index 4f1847248..c1eb9cc73 100644
--- a/src/layui/layui/layDialogs.h
+++ b/src/layui/layui/layDialogs.h
@@ -32,6 +32,7 @@
 #include <memory>
 
 class QTreeWidgetItem;
+class QModelIndex;
 
 namespace lay
 {