diff --git a/eth/downloader/queue.go b/eth/downloader/queue.go
index 26c41711d..ab3ae3d77 100644
--- a/eth/downloader/queue.go
+++ b/eth/downloader/queue.go
@@ -857,7 +857,7 @@ func (q *queue) deliver(id string, taskPool map[common.Hash]*types.Header,
 	}
 
 	for _, header := range request.Headers[:i] {
-		if res, stale, err := q.resultCache.GetDeliverySlot(header.Number.Uint64()); err == nil {
+		if res, stale, err := q.resultCache.GetDeliverySlot(header.Number.Uint64()); err == nil && !stale {
 			reconstruct(accepted, res)
 		} else {
 			// else: between here and above, some other peer filled this result,
diff --git a/les/downloader/queue.go b/les/downloader/queue.go
index 98ebff526..fe08c810a 100644
--- a/les/downloader/queue.go
+++ b/les/downloader/queue.go
@@ -870,7 +870,7 @@ func (q *queue) deliver(id string, taskPool map[common.Hash]*types.Header,
 	}
 
 	for _, header := range request.Headers[:i] {
-		if res, stale, err := q.resultCache.GetDeliverySlot(header.Number.Uint64()); err == nil {
+		if res, stale, err := q.resultCache.GetDeliverySlot(header.Number.Uint64()); err == nil && !stale {
 			reconstruct(accepted, res)
 		} else {
 			// else: between here and above, some other peer filled this result,