diff --git a/spine-csharp/src/SkeletonBounds.cs b/spine-csharp/src/SkeletonBounds.cs
index 9fe27ae9d..48caf8d5d 100644
--- a/spine-csharp/src/SkeletonBounds.cs
+++ b/spine-csharp/src/SkeletonBounds.cs
@@ -58,7 +58,7 @@ namespace Spine {
 
 			boundingBoxes.Clear();
 			for (int i = 0, n = polygons.Count; i < n; i++)
-				polygonPool.Add(polygons.Items[n]);
+				polygonPool.Add(polygons.Items[i]);
 			polygons.Clear();
 
 			for (int i = 0; i < slotCount; i++) {