diff --git a/les/protocol.go b/les/protocol.go
index cfebdbfb9a5a..dced7039e402 100644
--- a/les/protocol.go
+++ b/les/protocol.go
@@ -40,8 +40,9 @@ const (
 
 // Supported versions of the les protocol (first is primary)
 var (
-	ClientProtocolVersions = []uint{lpv2, lpv3, lpv4}
-	ServerProtocolVersions = []uint{lpv2, lpv3, lpv4}
+	ClientProtocolVersions    = []uint{lpv2, lpv3, lpv4}
+	ServerProtocolVersions    = []uint{lpv2, lpv3, lpv4}
+	AdvertiseProtocolVersions = []uint{lpv2} // clients are searching for the first advertised protocol in the list
 )
 
 // ProtocolLengths is the number of implemented message corresponding to different protocol versions.