diff --git a/les/api_backend.go b/les/api_backend.go
index 78f3ace10a..756beaf6a7 100644
--- a/les/api_backend.go
+++ b/les/api_backend.go
@@ -23,7 +23,6 @@ import (
 
 	"github.com/ethereum/go-ethereum/accounts"
 	"github.com/ethereum/go-ethereum/common"
-	"github.com/ethereum/go-ethereum/common/math"
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/bloombits"
 	"github.com/ethereum/go-ethereum/core/rawdb"