diff --git a/db.go b/db.go
index a5674056a..298c61243 100644
--- a/db.go
+++ b/db.go
@@ -45,7 +45,7 @@ import (
 var DefaultOptions = &Options{
 	WALFlushInterval:  5 * time.Second,
 	RetentionDuration: 15 * 24 * 60 * 60 * 1000, // 15 days in milliseconds
-	BlockRanges:       ExponentialBlockRanges(int64(2*time.Hour), 3, 5),
+	BlockRanges:       ExponentialBlockRanges(int64(2*time.Hour)/1e6, 3, 5),
 	NoLockfile:        false,
 }