diff --git a/src/lv_objx/lv_mbox.c b/src/lv_objx/lv_mbox.c
index 1e8767b4e..f56904cb0 100644
--- a/src/lv_objx/lv_mbox.c
+++ b/src/lv_objx/lv_mbox.c
@@ -139,7 +139,7 @@ lv_obj_t * lv_mbox_create(lv_obj_t * par, const lv_obj_t * copy)
  * @param btn_map button descriptor (button matrix map).
  *                E.g.  a const char *txt[] = {"ok", "close", ""} (Can not be local variable)
  */
-void lv_mbox_add_btns(lv_obj_t * mbox, const char ** btn_map)
+void lv_mbox_add_btns(lv_obj_t * mbox, const char * btn_map[])
 {
     LV_ASSERT_OBJ(mbox, LV_OBJX_NAME);
     LV_ASSERT_NULL(btn_map);
diff --git a/src/lv_objx/lv_mbox.h b/src/lv_objx/lv_mbox.h
index df504f851..2068b3735 100644
--- a/src/lv_objx/lv_mbox.h
+++ b/src/lv_objx/lv_mbox.h
@@ -94,7 +94,7 @@ lv_obj_t * lv_mbox_create(lv_obj_t * par, const lv_obj_t * copy);
  * @param btn_map button descriptor (button matrix map).
  *                E.g.  a const char *txt[] = {"ok", "close", ""} (Can not be local variable)
  */
-void lv_mbox_add_btns(lv_obj_t * mbox, const char ** btn_mapaction);
+void lv_mbox_add_btns(lv_obj_t * mbox, const char * btn_mapaction[]);
 
 /*=====================
  * Setter functions