diff --git a/common/net/address.go b/common/net/address.go
index 6ab0587f4..04d40f0c7 100644
--- a/common/net/address.go
+++ b/common/net/address.go
@@ -22,7 +22,7 @@ var (
 )
 
 // AddressFamily is the type of address.
-type AddressFamily int
+type AddressFamily byte
 
 const (
 	// AddressFamilyIPv4 represents address as IPv4