diff --git a/src/widgets/list/lv_list.h b/src/widgets/list/lv_list.h
index 0c3894d045..0c4ffed1e4 100644
--- a/src/widgets/list/lv_list.h
+++ b/src/widgets/list/lv_list.h
@@ -17,6 +17,10 @@ extern "C" {
 
 #if LV_USE_LIST
 
+#if LV_USE_FLEX == 0
+#error "lv_list: lv_flex is required. Enable it in lv_conf.h (LV_USE_FLEX 1)"
+#endif
+
 /*********************
  *      DEFINES
  *********************/
diff --git a/src/widgets/menu/lv_menu.h b/src/widgets/menu/lv_menu.h
index e7bcb71351..34edb6c4e5 100644
--- a/src/widgets/menu/lv_menu.h
+++ b/src/widgets/menu/lv_menu.h
@@ -18,7 +18,7 @@ extern "C" {
 #if LV_USE_MENU
 
 #if LV_USE_FLEX == 0
-#error "LV_USE_FLEX needs to be enabled"
+#error "lv_menu: lv_flex is required. Enable it in lv_conf.h (LV_USE_FLEX 1)"
 #endif
 
 /*********************