diff --git a/tree.go b/tree.go
index 8f92c62d..7064a1a1 100644
--- a/tree.go
+++ b/tree.go
@@ -1154,14 +1154,14 @@ func (leaf *LeafNode) Commit() *Point {
 			frPool.Put(c1polyp)
 		}()
 
-		count = fillSuffixTreePoly(c1poly[:], leaf.values[:128])
-		leaf.c1 = cfg.CommitToPoly(c1poly[:], 256-count)
+		count = fillSuffixTreePoly(c1poly, leaf.values[:128])
+		leaf.c1 = cfg.CommitToPoly(c1poly, 256-count)
 
 		for i := 0; i < 256; i++ {
 			c1poly[i] = Fr{}
 		}
-		count = fillSuffixTreePoly(c1poly[:], leaf.values[128:])
-		leaf.c2 = cfg.CommitToPoly(c1poly[:], 256-count)
+		count = fillSuffixTreePoly(c1poly, leaf.values[128:])
+		leaf.c2 = cfg.CommitToPoly(c1poly, 256-count)
 
 		for i := 0; i < 256; i++ {
 			c1poly[i] = Fr{}
@@ -1170,7 +1170,7 @@ func (leaf *LeafNode) Commit() *Point {
 		StemFromBytes(&c1poly[1], leaf.stem)
 
 		toFrMultiple([]*Fr{&c1poly[2], &c1poly[3]}, []*Point{leaf.c1, leaf.c2})
-		leaf.commitment = cfg.CommitToPoly(c1poly[:], 252)
+		leaf.commitment = cfg.CommitToPoly(c1poly, 252)
 
 	} else if len(leaf.cow) != 0 {
 		// If we've already have a calculated commitment, and there're touched leaf values, we do a diff update.
@@ -1180,14 +1180,14 @@ func (leaf *LeafNode) Commit() *Point {
 			if !bytes.Equal(oldValue, leaf.values[i]) {
 				if i < 128 {
 					if c1 == nil {
-						c1, old1 = leaf.getOldCn(byte(i))
+						c1, old1 = leaf.getOldCn(i)
 					}
-					leaf.updateCn(byte(i), oldValue, c1)
+					leaf.updateCn(i, oldValue, c1)
 				} else {
 					if c2 == nil {
-						c2, old2 = leaf.getOldCn(byte(i))
+						c2, old2 = leaf.getOldCn(i)
 					}
-					leaf.updateCn(byte(i), oldValue, c2)
+					leaf.updateCn(i, oldValue, c2)
 				}
 			}
 		}