diff --git a/tests/test_pkgset_pkgsets.py b/tests/test_pkgset_pkgsets.py
index cc59f5bf..94d566a2 100644
--- a/tests/test_pkgset_pkgsets.py
+++ b/tests/test_pkgset_pkgsets.py
@@ -137,6 +137,21 @@ class PkgsetCompareMixin(object):
 @mock.patch("pungi.phases.pkgset.pkgsets.ReaderPool", new=FakePool)
 @mock.patch("kobo.pkgset.FileCache", new=MockFileCache)
 class TestKojiPkgset(PkgsetCompareMixin, helpers.PungiTestCase):
+
+    @classmethod
+    def setUpClass(cls) -> None:
+
+        cls.patcher = mock.patch.object(
+            pkgsets.KojiMockPackageSet,
+            '_is_rpm_signed',
+            return_value=True,
+        )
+        cls.patcher.start()
+
+    @classmethod
+    def tearDownClass(cls) -> None:
+        cls.patcher.stop()
+
     def setUp(self):
         super(TestKojiPkgset, self).setUp()
         with open(os.path.join(helpers.FIXTURE_DIR, "tagged-rpms.json")) as f: