diff --git a/roles/mariadb/tasks/main.yml b/roles/mariadb/tasks/main.yml
index 364a0a3..026b491 100644
--- a/roles/mariadb/tasks/main.yml
+++ b/roles/mariadb/tasks/main.yml
@@ -35,13 +35,13 @@
 
 - name: Create WordPress database(s)
   mysql_db: db={{ item.wordpress_db_name }} state=present encoding=utf8mb4
-  with_items: wordpress_blogs
+  with_items: "{{ wordpress_blogs }}"
   when: wordpress_blogs is defined
   tags: mariadb
 
 - name: Create WordPress user(s)
   mysql_user: name={{ item.wordpress_db_user }} password={{ item.wordpress_db_pass }} priv={{ item.wordpress_db_name }}.*:ALL state=present
-  with_items: wordpress_blogs
+  with_items: "{{ wordpress_blogs }}"
   when: wordpress_blogs is defined
   tags: mariadb
 
diff --git a/roles/nginx/tasks/vhosts.yml b/roles/nginx/tasks/vhosts.yml
index 75a725e..a7b4792 100644
--- a/roles/nginx/tasks/vhosts.yml
+++ b/roles/nginx/tasks/vhosts.yml
@@ -2,7 +2,7 @@
 
 - name: Configure https vhosts
   template: src=vhost.conf.j2 dest={{ nginx_confd_path }}/{{ item.domain_name }}.conf mode=0644 owner=root group=root
-  with_items: nginx_vhosts
+  with_items: "{{ nginx_vhosts }}"
   notify:
     - reload nginx
 
@@ -18,18 +18,18 @@
 
 - name: Create vhost document roots
   file: path={{ nginx_root_prefix }}/{{ item.domain_name }} state=directory mode=0755 owner=nginx group=nginx
-  with_items: nginx_vhosts
+  with_items: "{{ nginx_vhosts }}"
 
 - name: Install WordPress
   git: repo=https://github.com/WordPress/WordPress.git dest={{ nginx_root_prefix }}/{{ item.domain_name }}/wordpress version={{ item.wordpress_version }} depth=1
   when: item.has_wordpress == 'yes'
-  with_items: nginx_vhosts
+  with_items: "{{ nginx_vhosts }}"
   tags: wordpress
 
 - name: Fix WordPress directory permissions
   file: path={{ nginx_root_prefix }}/{{ item.domain_name }} state=directory owner=nginx group=nginx recurse=yes
   when: item.has_wordpress == 'yes'
-  with_items: nginx_vhosts
+  with_items: "{{ nginx_vhosts }}"
   tags: wordpress
 
 # vim: set ts=2 sw=2:
diff --git a/roles/php5-fpm/tasks/main.yml b/roles/php5-fpm/tasks/main.yml
index 6faaa8b..b27335f 100644
--- a/roles/php5-fpm/tasks/main.yml
+++ b/roles/php5-fpm/tasks/main.yml
@@ -11,7 +11,7 @@
 
 - name: Copy php5-fpm pool config
   template: src=pool.conf.j2 dest=/etc/php5/fpm/pool.d/{{ item.domain_name }}.conf owner=root group=root mode=0644
-  with_items: nginx_vhosts
+  with_items: "{{ nginx_vhosts }}"
   when: nginx_vhosts is defined
   notify: restart php5-fpm
   tags: php5-fpm