diff --git a/common.c b/common.c
index 7a9d2cc..d30ef30 100644
--- a/common.c
+++ b/common.c
@@ -376,6 +376,17 @@ enum socks_protocol
 	SOCKS_MAX                           ///< End of protocol
 };
 
+static inline const char *
+socks_protocol_to_string (enum socks_protocol self)
+{
+	switch (self)
+	{
+	case SOCKS_5:   return "SOCKS5";
+	case SOCKS_4A:  return "SOCKS4A";
+	default:        return NULL;
+	}
+}
+
 struct socks_connector
 {
 	struct connector *connector;        ///< Proxy server iterator (effectively)
@@ -828,7 +839,7 @@ socks_connector_on_connecting (void *user_data, const char *via)
 	char *address = format_host_port_pair (target->address_str, port);
 	free (port);
 	self->on_connecting (self->user_data, address, via,
-		self->protocol_iter ? "SOCKS4A" : "SOCKS5");
+		socks_protocol_to_string (self->protocol_iter));
 	free (address);
 }