diff --git a/lv_draw/lv_draw.c b/lv_draw/lv_draw.c
index aadaa93f6..64e0bb764 100644
--- a/lv_draw/lv_draw.c
+++ b/lv_draw/lv_draw.c
@@ -2023,7 +2023,7 @@ static void lv_draw_shadow_full_straight(const lv_area_t * coords, const lv_area
 
     lv_opa_t opa_act;
     int16_t d;
-    for(d = 1; d <= swidth; d++) {
+    for(d = 1; d < swidth; d++) {
         opa_act = map[d];
         fill_fp(&right_area, mask, style->body.shadow.color, opa_act);
         right_area.x1++;