diff --git a/tasks/main.yml b/tasks/main.yml
index 11e8d95..8840ced 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -23,6 +23,16 @@
     php_extension_conf_path: "{{ __php_extension_conf_path }}"
   when: php_extension_conf_path is not defined
 
+- name: Define php_apc_conf_filename.
+  set_fact:
+    php_apc_conf_filename: "{{ __php_apc_conf_filename }}"
+  when: php_apc_conf_filename is not defined
+
+- name: Define php_opcache_conf_filename.
+  set_fact:
+    php_opcache_conf_filename: "{{ __php_opcache_conf_filename }}"
+  when: php_opcache_conf_filename is not defined
+
 # Setup/install tasks.
 - include: setup-RedHat.yml
   when: (php_install_from_source == false) and (ansible_os_family == 'RedHat')
diff --git a/vars/Debian.yml b/vars/Debian.yml
index 52d3298..7875d6e 100644
--- a/vars/Debian.yml
+++ b/vars/Debian.yml
@@ -18,6 +18,6 @@ __php_webserver_daemon: "apache2"
 __php_conf_path: "{{ '/etc/php5' if php_webserver_daemon and php_webserver_daemon != 'apache2' else '/etc/php5/apache2' }}"
 __php_extension_conf_path: "{{ __php_conf_path }}/conf.d"
 
-php_apc_conf_filename: 20-apc.ini
-php_opcache_conf_filename: 05-opcache.ini
+__php_apc_conf_filename: 20-apc.ini
+__php_opcache_conf_filename: 05-opcache.ini
 php_fpm_daemon: php5-fpm
diff --git a/vars/RedHat.yml b/vars/RedHat.yml
index 7e3e303..4e5d8de 100644
--- a/vars/RedHat.yml
+++ b/vars/RedHat.yml
@@ -20,6 +20,6 @@ __php_webserver_daemon: "httpd"
 __php_conf_path: /etc
 php_extension_conf_path: /etc/php.d
 
-php_apc_conf_filename: apc.ini
-php_opcache_conf_filename: opcache.ini
+__php_apc_conf_filename: apc.ini
+__php_opcache_conf_filename: opcache.ini
 php_fpm_daemon: php-fpm