diff --git a/2020/day03/main.go b/2020/day03/main.go
index ce5c10a..030122f 100644
--- a/2020/day03/main.go
+++ b/2020/day03/main.go
@@ -28,8 +28,8 @@ func countTrees(field h.CoordByteMap, x, y int) int {
 	trees := 0
 	pos := h.Coordinate{X: x, Y: y}
 	for pos.Y < field.Height {
-		if pos.X > field.Width {
-			pos.X = pos.X - field.Width - 1
+		if pos.X >= field.Width {
+			pos.X = pos.X - field.Width
 		}
 		if field.Get(pos) == '#' {
 			trees++