diff --git a/system/t04_mirror/ShowMirror8Test_gold b/system/t04_mirror/ShowMirror8Test_gold
index 2b8ae8fe..dedfcd19 100644
--- a/system/t04_mirror/ShowMirror8Test_gold
+++ b/system/t04_mirror/ShowMirror8Test_gold
@@ -23,7 +23,6 @@
     "Label": "Debian-Security",
     "Origin": "Debian",
     "Suite": "oldoldstable",
-    "Valid-Until": "Sat, 05 Feb 2022 10:02:07 UTC",
     "Version": "9"
   },
   "LastDownloadDate": "0001-01-01T00:00:00Z",
diff --git a/system/t04_mirror/show.py b/system/t04_mirror/show.py
index ce1d25d4..9323a68c 100644
--- a/system/t04_mirror/show.py
+++ b/system/t04_mirror/show.py
@@ -39,7 +39,7 @@ class ShowMirror4Test(BaseTest):
     runCmd = "aptly mirror show mirror4"
 
     def outputMatchPrepare(self, s):
-        return re.sub(r"(Date|Valid-Until): [,0-9:+A-Za-z -]+\n", "", s)
+        return re.sub(r"(Date): [,0-9:+A-Za-z -]+\n", "", s)
 
 
 class ShowMirror5Test(BaseTest):