diff --git a/plugins/test/unit/plugins/importers/test_sync.py b/plugins/test/unit/plugins/importers/test_sync.py
index a894faf5a..b76644845 100644
--- a/plugins/test/unit/plugins/importers/test_sync.py
+++ b/plugins/test/unit/plugins/importers/test_sync.py
@@ -237,6 +237,7 @@ def test_SaveMetadata(self, _UnitKeyToUnit):
     @mock.patch('pulp_deb.plugins.importers.sync.gnupg.GPG')
     def test_VerifySignature(self, _GPG, _DebRelease, _DebComponent):
         key_fpr = '0000111122223333444455556666777788889999AAAABBBBCCCCDDDDEEEEFFFF'
+        _GPG.return_value.list_keys.return_value = [dict(fingerprint=key_fpr)]
         step = self.step.children[1]
         self.assertEquals(constants.SYNC_STEP_RELEASE_PARSE, step.step_id)
         step.get_config().repo_plugin_config['require_signature'] = True