diff --git a/blockdag/blockheap.go b/blockdag/blockheap.go
index 4576bcd4d..428e4c17a 100644
--- a/blockdag/blockheap.go
+++ b/blockdag/blockheap.go
@@ -67,7 +67,7 @@ func (bh blockHeap) Push(block *blockNode) {
 
 // pushSet pushes a blockset to the heap.
 func (bh blockHeap) pushSet(bs blockSet) {
-	for _, block := range bs {
+	for block := range bs {
 		heap.Push(bh.impl, block)
 	}
 }