diff --git a/defaults/main.yml b/defaults/main.yml
index 23d0f91..2628922 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -19,7 +19,7 @@ docker_apt_release_channel: stable
 docker_apt_arch: amd64
 docker_apt_repository: "deb [arch={{ docker_apt_arch }}] https://download.docker.com/linux/{{ ansible_distribution|lower }} {{ ansible_distribution_release }} {{ docker_apt_release_channel }}"
 docker_apt_ignore_key_error: true
-docker_apt_version:
+docker_apt_version: ''
 
 # Used only for RedHat/CentOS/Fedora.
 docker_yum_repo_url: https://download.docker.com/linux/{{ (ansible_distribution == "Fedora") | ternary("fedora","centos") }}/docker-{{ docker_edition }}.repo
diff --git a/tasks/setup-Debian.yml b/tasks/setup-Debian.yml
index 2409510..ae7187d 100644
--- a/tasks/setup-Debian.yml
+++ b/tasks/setup-Debian.yml
@@ -43,4 +43,4 @@
   template:
     src: apt-preferences-docker.j2
     dest: /etc/apt/preferences.d/docker
-  when: docker_apt_version is defined and not empty
+  when: docker_apt_version | length > 0