diff --git a/statediff/service.go b/statediff/service.go
index 729c9503a..4bdb9bf50 100644
--- a/statediff/service.go
+++ b/statediff/service.go
@@ -18,6 +18,7 @@ package statediff
 
 import (
 	"bytes"
+	"fmt"
 	"math/big"
 	"strconv"
 	"strings"