diff --git a/library/roles/apache/tasks/apache-modules.yml b/library/roles/apache/tasks/apache-modules.yml
index 10b5333d..285242ba 100644
--- a/library/roles/apache/tasks/apache-modules.yml
+++ b/library/roles/apache/tasks/apache-modules.yml
@@ -8,33 +8,33 @@
 
 - name: Install the libapache2-mod-rpaf module
   apt: pkg=libapache2-mod-rpaf state=present
-  when: apache_rpaf_install
+  when: apache_rpaf_install | bool
   tags: [ 'apache', 'apache_mods', 'apache_rpaf' ]
 
 - name: Enable the apache rpaf module
   apache2_module: name=rpaf state=present
-  when: apache_rpaf_install
+  when: apache_rpaf_install | bool
   notify: apache2 reload
   tags: [ 'apache', 'apache_mods', 'apache_rpaf' ]
 
 - name: Load the apache ssl modules
   apache2_module: name={{ item }} state=present
   with_items: '{{ apache_ssl_modules }}'
-  when: apache_ssl_modules_enabled
+  when: apache_ssl_modules_enabled | bool
   notify: apache2 reload
   tags: [ 'apache', 'apache_mods' ]
 
 - name: Load some apache proxy modules
   apache2_module: name={{ item }} state=present
   with_items: '{{ apache_http_proxy_modules }}'
-  when: apache_http_proxy_modules_enabled
+  when: apache_http_proxy_modules_enabled | bool
   notify: apache2 reload
   tags: [ 'apache', 'apache_mods' ]
 
 - name: Load additional apache modules if any
   apache2_module: name={{ item }} state=present
   with_items: '{{ apache_additional_modules_list  | default ([]) }}'
-  when: apache_additional_modules
+  when: apache_additional_modules_list is defined
   notify: apache2 reload
   tags: [ 'apache', 'apache_mods' ]
 
@@ -47,28 +47,28 @@
 - name: Load the apache status module
   apache2_module: name={{ item }} state=present
   with_items: status
-  when: apache_status_module 
+  when: apache_status_module | bool
   notify: apache2 reload
   tags: [ 'apache', 'apache_mods', 'apache_status' ]
 
 - name: Configure the apache status module
   template: src={{ item }}.j2 dest=/etc/apache2/mods-available/{{ item }} owner=root group=root mode=0644
   with_items: status.conf
-  when: apache_status_module 
+  when: apache_status_module  | bool
   notify: apache2 reload
   tags: [ 'apache', 'apache_mods', 'apache_status' ]
 
 - name: Load the apache info module
   apache2_module: name={{ item }} state=present
   with_items: info
-  when: apache_info_module 
+  when: apache_info_module | bool
   notify: apache2 reload
   tags: [ 'apache', 'apache_mods', 'apache_info' ]
 
 - name: Configure the apache info module
   template: src={{ item }}.j2 dest=/etc/apache2/mods-available/{{ item }} owner=root group=root mode=0644
   with_items: info.conf
-  when: apache_info_module 
+  when: apache_info_module | bool
   notify: apache2 reload
   tags: [ 'apache', 'apache_mods', 'apache_info' ]