diff --git a/src/core/lv_global.h b/src/core/lv_global.h
index 28a7085d83..cdacdee623 100644
--- a/src/core/lv_global.h
+++ b/src/core/lv_global.h
@@ -191,6 +191,7 @@ typedef struct _lv_global_t {
     void * objid_array;
     uint32_t objid_count;
 #endif
+    void * user_data;
 } lv_global_t;