diff --git a/eth/downloader/downloader.go b/eth/downloader/downloader.go
index fc06cbd62e..9a30f8655a 100644
--- a/eth/downloader/downloader.go
+++ b/eth/downloader/downloader.go
@@ -450,7 +450,7 @@ func (d *Downloader) syncWithPeer(p *peer, hash common.Hash, td *big.Int) (err e
 	}
 	if d.mode == FastSync {
 		fetchers = append(fetchers, func() error { return d.processFastSyncContent(latest) })
-	} else {
+	} else if d.mode == FullSync {
 		fetchers = append(fetchers, d.processFullSyncContent)
 	}
 	err = d.spawnSync(fetchers)