diff --git a/CHANGELOG_PENDING.md b/CHANGELOG_PENDING.md
index 58ac79bfd..e33081dd4 100644
--- a/CHANGELOG_PENDING.md
+++ b/CHANGELOG_PENDING.md
@@ -30,3 +30,4 @@ program](https://hackerone.com/tendermint).
 ### BUG FIXES:
 
 - [tools] [\#4023](https://github.com/tendermint/tendermint/issues/4023) Refresh `tm-monitor` health when validator count is updated (@erikgrinaker)
+- [state] [\#4104](https://github.com/tendermint/tendermint/pull/4104) txindex/kv: Fsync data to disk immediately after receiving it (@guagualvcha)
diff --git a/state/txindex/kv/kv.go b/state/txindex/kv/kv.go
index 8fcce4862..dd9c5f300 100644
--- a/state/txindex/kv/kv.go
+++ b/state/txindex/kv/kv.go
@@ -103,7 +103,7 @@ func (txi *TxIndex) AddBatch(b *txindex.Batch) error {
 		storeBatch.Set(hash, rawBytes)
 	}
 
-	storeBatch.Write()
+	storeBatch.WriteSync()
 	return nil
 }
 
@@ -132,7 +132,7 @@ func (txi *TxIndex) Index(result *types.TxResult) error {
 	}
 
 	b.Set(hash, rawBytes)
-	b.Write()
+	b.WriteSync()
 
 	return nil
 }