diff --git a/ethdb/database.go b/ethdb/database.go
index d46b42ab27..8c286ce840 100644
--- a/ethdb/database.go
+++ b/ethdb/database.go
@@ -1,6 +1,9 @@
 package ethdb
 
 import (
+        "strconv"
+        "strings"
+        "time"
         "github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/compression/rle"
 	"github.com/ethereum/go-ethereum/logger"