diff --git a/pungi/phases/osbs.py b/pungi/phases/osbs.py
index 6ddbfefe..c0626784 100644
--- a/pungi/phases/osbs.py
+++ b/pungi/phases/osbs.py
@@ -89,7 +89,7 @@ class OSBSThread(WorkerThread):
     def _add_metadata(self, koji_proxy, variant, task_id):
         # Create metadata
         result = koji_proxy.getTaskResult(task_id)
-        build_id = result['koji_builds'][0]
+        build_id = int(result['koji_builds'][0])
         buildinfo = koji_proxy.getBuild(build_id)
         archives = koji_proxy.listArchives(build_id)
 
diff --git a/tests/test_osbs_phase.py b/tests/test_osbs_phase.py
index 0b719bcf..917278d9 100755
--- a/tests/test_osbs_phase.py
+++ b/tests/test_osbs_phase.py
@@ -209,8 +209,8 @@ class OSBSThreadTest(helpers.PungiTestCase):
                 mock.call.watch_task(
                     12345, self.topdir + '/logs/global/osbs/Server-1-watch-task.log'),
                 mock.call.koji_proxy.getTaskResult(12345),
-                mock.call.koji_proxy.getBuild('54321'),
-                mock.call.koji_proxy.listArchives('54321')])
+                mock.call.koji_proxy.getBuild(54321),
+                mock.call.koji_proxy.listArchives(54321)])
 
     def _assertRepoFile(self):
         with open(self.topdir + '/work/global/tmp-Server/compose-rpms-1.repo') as f: