diff --git a/contrib/init/systemd/docker.service b/contrib/init/systemd/docker.service
index bc7344884..9bfc75905 100644
--- a/contrib/init/systemd/docker.service
+++ b/contrib/init/systemd/docker.service
@@ -1,6 +1,6 @@
 [Unit]
 Description=Docker Application Container Engine
-Documentation=http://docs.docker.com
+Documentation=https://docs.docker.com
 After=network.target docker.socket
 Requires=docker.socket