diff --git a/ui/stackpanel.go b/ui/stackpanel.go
index 6ae42a9..74c5819 100644
--- a/ui/stackpanel.go
+++ b/ui/stackpanel.go
@@ -42,7 +42,9 @@ func (p *StackPanel) Arrange(ctx Context, bounds geom.RectangleF32, offset geom.
 				height = remainder / float32(stretch)
 			}
 		}
-		var child = geom.RectF32(bounds.Min.X, bounds.Min.Y+childOffset, bounds.Max.X, bounds.Min.Y+childOffset+height)
+		minY := geom.Min32(bounds.Max.Y, bounds.Min.Y+childOffset)
+		maxY := geom.Min32(bounds.Max.Y, bounds.Min.Y+childOffset+height)
+		var child = geom.RectF32(bounds.Min.X, minY, bounds.Max.X, maxY)
 		p.Children[i].Arrange(ctx, p.Orientation.FlipRect(child), offset, p)
 		childOffset += height
 	}