diff --git a/playbooks/upgrade-docker-ce.yaml b/playbooks/upgrade-docker-ce.yaml
index 6a59f2f..7542280 100644
--- a/playbooks/upgrade-docker-ce.yaml
+++ b/playbooks/upgrade-docker-ce.yaml
@@ -99,9 +99,9 @@ steps:
     shell: |
       codename=$(lsb_release -cs)
       arch=$(dpkg --print-architecture)
-      echo "deb [arch=${arch} signed-by=/etc/apt/keyrings/docker.gpg] \
-https://download.docker.com/linux/debian ${codename} stable" \
-        | sudo tee /etc/apt/sources.list.d/docker.list >/dev/null
+      url="https://download.docker.com/linux/debian"
+      line="deb [arch=${arch} signed-by=/etc/apt/keyrings/docker.gpg] ${url} ${codename} stable"
+      echo "${line}" | sudo tee /etc/apt/sources.list.d/docker.list >/dev/null
     sudo: true
     when: '[ ! -f /etc/apt/sources.list.d/docker.list ]'