diff --git a/doc/source/third_party.rst b/doc/source/third_party.rst
index b122e6baf3..69b45df55e 100644
--- a/doc/source/third_party.rst
+++ b/doc/source/third_party.rst
@@ -9,7 +9,7 @@ to test commits against testing systems beyond those supplied by OpenStack's
 Jenkins setup.  It is also possible for these systems to feed information back
 into Gerrit and they can also leave non-gating votes on Gerrit review requests.
 
-An example of one such system is `Smokestack <http://smokestack.openstack.org/>`_.
+An example of one such system is `Smokestack <https://smokestack.openstack.org/>`_.
 Smokestack reads the Gerrit event stream and runs it's own tests on the commits.
 If one of the tests fails it will publish information and links to the failure
 on the review in Gerrit.