diff --git a/src/lv_widgets/lv_rotary.c b/src/lv_widgets/lv_rotary.c
index 629ade3aa..fe459587f 100644
--- a/src/lv_widgets/lv_rotary.c
+++ b/src/lv_widgets/lv_rotary.c
@@ -151,7 +151,7 @@ void lv_rotary_set_value(lv_obj_t * rotary, int16_t value, lv_anim_enable_t anim
         lv_arc_set_start_angle(
             rotary,
             _lv_map(ext->cur_value, ext->max_value, ext->min_value, 
-                    ext->arc.arc_angle_start, 360 + ext->arc.bg_angle_end)
+                    360 + ext->arc.bg_angle_end, ext->arc.bg_angle_start)
         );
     } else {
         lv_arc_set_end_angle(