diff --git a/tests/certbund_contact/test_annotations.py b/tests/certbund_contact/test_annotations.py
index 3b3f2fb..bef1f0f 100644
--- a/tests/certbund_contact/test_annotations.py
+++ b/tests/certbund_contact/test_annotations.py
@@ -145,6 +145,12 @@ def test_annotation_class_instantiation_no_condition(self):
     def test_annotation_no_expiry(self):
         self.assertFalse(Annotation("a").expired)
 
+    def test_annotation_no_expiry_empty_string(self):
+        self.assertFalse(Annotation("a", None, '').expired)
+        annotation = from_json(json.loads('{"tag": "bla"'
+                                          ',"expired": ""}'))
+        self.assertFalse(annotation.expired)
+
     def test_annotation_expired(self):
         self.assertFalse(Annotation("a", None, "9999-99-99").expired)