diff --git a/ipset/ipset_linux.go b/ipset/ipset_linux.go
index 01ce51c..0009e8a 100644
--- a/ipset/ipset_linux.go
+++ b/ipset/ipset_linux.go
@@ -7,6 +7,7 @@ package ipset
 import (
 	"bytes"
 	"encoding/binary"
+	"errors"
 	"net"
 	"strings"
 	"sync"