diff --git a/test/regression.uts b/test/regression.uts
index aae607815a0dbbb497a6ddae39938f46c1514e7a..baee093ae1ad4cff7e4e77a70ba0489d10a44110 100644
--- a/test/regression.uts
+++ b/test/regression.uts
@@ -92,6 +92,7 @@ TCP in a
 a[TCP]
 a[TCP].dport=[80,443]
 a
+assert(a.copy().time == a.time)
 a=3