diff --git a/tasks/docker.yml b/tasks/docker.yml
index 73e9968..d5d72c2 100644
--- a/tasks/docker.yml
+++ b/tasks/docker.yml
@@ -21,7 +21,7 @@
     url: https://download.docker.com/linux/ubuntu/gpg
     id: 9DC858229FC7DD38854AE2D88D81803C0EBFCD88
     state: present
-    register: add_repository_key
+  register: add_repository_key
 
 - name: Ensure curl is present (on older systems without SNI).
   package: