diff --git a/day-09/internal/two/disk.go b/day-09/internal/two/disk.go
index 037b8e1..3611ba9 100644
--- a/day-09/internal/two/disk.go
+++ b/day-09/internal/two/disk.go
@@ -123,7 +123,7 @@ func (d *disk) write() {
 
 	allBlocks = append(allBlocks, d.fileblocks...)
 
-	for i := 0; i < numEmptyBlocks; i++ {
+	for i := range numEmptyBlocks {
 		for !d.emptyblocks[i].IsEmpty() {
 			allBlocks = append(allBlocks, heap.Pop(&d.emptyblocks[i]).(*block))
 		}