diff --git a/internal/rpc/group/group.go b/internal/rpc/group/group.go
index 639e20070..a2eaf3457 100644
--- a/internal/rpc/group/group.go
+++ b/internal/rpc/group/group.go
@@ -189,8 +189,8 @@ func (s *groupServer) resolveFriendDisplayName(ctx context.Context, ownerUserID,
 	if err != nil || len(users) == 0 {
 		return "", err
 	}
-	if users[0].FirstName != "" {
-		return users[0].FirstName, nil
+	if users[0].FirstName != "" || users[0].LastName != "" {
+		return users[0].FirstName + " " + users[0].LastName, nil
 	}
 	return users[0].Nickname, nil
 }
diff --git a/protocol b/protocol
index c5adb72b8..bf66521b2 160000
--- a/protocol
+++ b/protocol
@@ -1 +1 @@
-Subproject commit c5adb72b8d02244a5d3d7d814e607e9b6256fdd6
+Subproject commit bf66521b27c2302dcae38ff441b035cd443edf20