diff --git a/projection.go b/projection.go
index fe1bb0b..c90d7d1 100644
--- a/projection.go
+++ b/projection.go
@@ -80,7 +80,7 @@ func (p *projection) visibleTiles(action func(int, int, geom.Point)) {
 	topLeft := p.screenToMap(visible.Min.X, visible.Min.Y)
 	topRight := p.screenToMap(visible.Max.X, visible.Min.Y)
 	bottomLeft := p.screenToMap(visible.Min.X, visible.Max.Y)
-	bottomRight := p.screenToMap(visible.Max.Y, visible.Max.Y)
+	bottomRight := p.screenToMap(visible.Max.X, visible.Max.Y)
 	minY, maxY := int(Floor32(topRight.Y)), int(Ceil32(bottomLeft.Y))
 	minX, maxX := int(Floor32(topLeft.X)), int(Ceil32(bottomRight.X))
 	for y := minY; y <= maxY; y++ {