diff --git a/tasks/docker-update.yml b/tasks/docker-update.yml
index e83c18c..44be937 100644
--- a/tasks/docker-update.yml
+++ b/tasks/docker-update.yml
@@ -15,7 +15,7 @@
 
 
 - name: can docker be updated
-  shell: {{ registry_pkg_manager }} check-update docker
+  shell: "{{ registry_pkg_manager }} check-update docker"
   register: docker_check_update
   failed_when: docker_check_update.rc not in [0, 100]
   changed_when: docker_check_update.rc == 100