diff --git a/mock.go b/mock.go
index 3c6a3b9..25eaba6 100644
--- a/mock.go
+++ b/mock.go
@@ -301,6 +301,9 @@ func (m *mock) mapArgs(cmd string, cmdArgs *[]interface{}) bool {
 	case "hset", "hmset":
 		// 2
 		cut = 2
+	case "xadd":
+		// 3
+		cut = 3
 	case "eval", "evalsha":
 		// more, i guess nobody uses it (eval/evalsha), miss
 		return false