diff --git a/eth/config.go b/eth/config.go
index d0ab2ed258..0bc6453b8f 100644
--- a/eth/config.go
+++ b/eth/config.go
@@ -95,7 +95,7 @@ type Config struct {
 	// zero, the chain ID is used as network ID.
 	NetworkId uint64
 
-	SyncMode  downloader.SyncMode
+	SyncMode downloader.SyncMode
 
 	NoPruning  bool // Whether to disable pruning and flush everything to disk
 	NoPrefetch bool // Whether to disable prefetching and only load state on demand