--- a/testing/mozharness/mozharness/mozilla/building/buildbase.py
+++ b/testing/mozharness/mozharness/mozilla/building/buildbase.py
@@ -1198,17 +1198,17 @@ or run without that action (ie: --no-{ac
             if changes:
                 comments = changes[0].get('comments', '')
                 self.set_buildbot_property('comments',
                                            comments,
                                            write_to_file=True)
             else:
                 self.warning(ERROR_MSGS['comments_undetermined'])
             self.set_buildbot_property('got_revision',
-                                       rev[:12],
+                                       rev,
                                        write_to_file=True)
 
     def _count_ctors(self):
         """count num of ctors and set testresults."""
         dirs = self.query_abs_dirs()
         python_path = os.path.join(dirs['abs_work_dir'], 'venv', 'bin',
                                    'python')
         abs_count_ctors_path = os.path.join(dirs['abs_src_dir'],