diff --git a/eth/backend.go b/eth/backend.go
index 22be2ef961..b08dcea61b 100644
--- a/eth/backend.go
+++ b/eth/backend.go
@@ -224,9 +224,7 @@ func New(stack *node.Node, config *ethconfig.Config) (*Ethereum, error) {
 		eth.blockchain.SetHead(compat.RewindTo)
 		rawdb.WriteChainConfig(chainDb, genesisHash, chainConfig)
 	}
-	if !config.AncientPrune {
-		eth.bloomIndexer.Start(eth.blockchain)
-	}
+	eth.bloomIndexer.Start(eth.blockchain)
 
 	if config.TxPool.Journal != "" {
 		config.TxPool.Journal = stack.ResolvePath(config.TxPool.Journal)