diff --git a/system/t04_mirror/UpdateMirror22Test_gold b/system/t04_mirror/UpdateMirror22Test_gold
index 75ac9635..296cc0bd 100644
--- a/system/t04_mirror/UpdateMirror22Test_gold
+++ b/system/t04_mirror/UpdateMirror22Test_gold
@@ -4,7 +4,7 @@ openpgp: Good signature from "NVIDIA CORPORATION (Open Source Projects) <cudatoo
 Downloading & parsing package files...
 Downloading https://nvidia.github.io/libnvidia-container/ubuntu16.04/amd64/Packages.xz...
 Applying filter...
-Packages filtered: 20 -> 0.
+
 Building download queue...
 Download queue: 0 items (0 B)
 
diff --git a/system/t04_mirror/update.py b/system/t04_mirror/update.py
index 3ec79144..5f63ec35 100644
--- a/system/t04_mirror/update.py
+++ b/system/t04_mirror/update.py
@@ -373,4 +373,6 @@ class UpdateMirror22Test(BaseTest):
         "aptly mirror create --keyring=aptlytest.gpg --filter=nomatch libnvidia-container https://nvidia.github.io/libnvidia-container/ubuntu16.04/amd64 ./"
     ]
     runCmd = "aptly mirror update --keyring=aptlytest.gpg libnvidia-container"
-    outputMatchPrepare = filterOutSignature
+
+    def outputMatchPrepare(_, s):
+        return re.sub(r'Signature made .* using|Packages filtered: .* -> 0.', '', s)