diff --git a/p2p/enode/urlv4.go b/p2p/enode/urlv4.go
index dadcaee265..9ecf6097e5 100644
--- a/p2p/enode/urlv4.go
+++ b/p2p/enode/urlv4.go
@@ -31,9 +31,10 @@ import (
 	"github.com/ethereum/go-ethereum/p2p/enr"
 )
 
-var incompleteNodeURL = regexp.MustCompile("(?i)^(?:enode://)?([0-9a-f]+)$")
-
-var lookupIPFunc func(name string) ([]net.IP, error)
+var (
+	incompleteNodeURL = regexp.MustCompile("(?i)^(?:enode://)?([0-9a-f]+)$")
+	lookupIPFunc = net.LookupIP
+)
 
 // MustParseV4 parses a node URL. It panics if the URL is not valid.
 func MustParseV4(rawurl string) *Node {