diff --git a/github/Issue.py b/github/Issue.py
index a800da3b..5fdff351 100644
--- a/github/Issue.py
+++ b/github/Issue.py
@@ -612,6 +612,7 @@ class Issue(github.GithubObject.CompletableGithubObject):
         return self.number
 
     def _initAttributes(self):
+        self._active_lock_reason = github.GithubObject.NotSet
         self._assignee = github.GithubObject.NotSet
         self._assignees = github.GithubObject.NotSet
         self._body = github.GithubObject.NotSet
@@ -625,6 +626,7 @@ class Issue(github.GithubObject.CompletableGithubObject):
         self._id = github.GithubObject.NotSet
         self._labels = github.GithubObject.NotSet
         self._labels_url = github.GithubObject.NotSet
+        self._locked = github.GithubObject.NotSet
         self._milestone = github.GithubObject.NotSet
         self._number = github.GithubObject.NotSet
         self._pull_request = github.GithubObject.NotSet
diff --git a/tests/Issue.py b/tests/Issue.py
index 4457c349..c67164be 100644
--- a/tests/Issue.py
+++ b/tests/Issue.py
@@ -80,6 +80,8 @@ class Issue(Framework.TestCase):
         self.assertEqual(
             self.issue.url, "https://api.github.com/repos/jacquev6/PyGithub/issues/28"
         )
+        self.assertFalse(self.issue.locked)
+        self.assertIsNone(self.issue.active_lock_reason)
         self.assertEqual(self.issue.user.login, "jacquev6")
         self.assertEqual(self.issue.repository.name, "PyGithub")
         self.assertEqual(
diff --git a/tests/RepositoryKey.py b/tests/RepositoryKey.py
index 0b6d8484..12a784fe 100644
--- a/tests/RepositoryKey.py
+++ b/tests/RepositoryKey.py
@@ -55,6 +55,7 @@ class RepositoryKey(Framework.TestCase):
         )
         self.assertEqual(self.key.created_at, datetime.datetime(2017, 2, 22, 8, 16, 23))
         self.assertTrue(self.key.verified)
+        self.assertTrue(self.key.read_only)
         self.assertEqual(
             repr(self.key), 'RepositoryKey(title="PyGithub Test Key", id=21870881)'
         )