diff --git a/manifests/docker.pp b/manifests/docker.pp
index 3845bbb9477fb3f365b7cc9b63419e5931c0353a..4b5b8c86889e0753863d334423cf1a3be9a8bd19 100644
--- a/manifests/docker.pp
+++ b/manifests/docker.pp
@@ -23,7 +23,7 @@ class ubuntu_server::docker($docker_compose_latest_version='1.8.1') {
 
     file{'/etc/apt/sources.list.d/docker.list':
         ensure  => present,
-        content => 'deb http://apt.dockerproject.org/repo ubuntu-trusty main',
+        content => 'deb [arch=amd64] http://apt.dockerproject.org/repo ubuntu-trusty main',
         notify  => Exec['apt-get-update'],
     }