diff --git a/tasks/main.yml b/tasks/main.yml
index 711ec51..c5352c0 100644
--- a/tasks/main.yml
+++ b/tasks/main.yml
@@ -13,6 +13,11 @@
     mysql_daemon: "{{ __mysql_daemon }}"
   when: mysql_daemon is not defined
 
+- name: Define mysql_slow_query_log_file.
+  set_fact:
+    mysql_slow_query_log_file: "{{ __mysql_slow_query_log_file }}"
+  when: mysql_slow_query_log_file is not defined
+
 # Setup/install tasks.
 - include: setup-RedHat.yml
   when: ansible_os_family == 'RedHat'
diff --git a/vars/Debian.yml b/vars/Debian.yml
index 292d71a..f106049 100644
--- a/vars/Debian.yml
+++ b/vars/Debian.yml
@@ -4,5 +4,6 @@ __mysql_packages:
   - mysql-common
   - mysql-server
   - python-mysqldb
+__mysql_slow_query_log_file: /var/log/mysql/mysql-slow.log
 mysql_config_file: /etc/mysql/my.cnf
 mysql_socket: /var/run/mysqld/mysqld.sock
diff --git a/vars/RedHat.yml b/vars/RedHat.yml
index 088ca4f..dbf9db6 100644
--- a/vars/RedHat.yml
+++ b/vars/RedHat.yml
@@ -4,5 +4,6 @@ __mysql_packages:
   - mysql
   - mysql-server
   - MySQL-python
+__mysql_slow_query_log_file: /var/log/mysql-slow.log
 mysql_config_file: /etc/my.cnf
 mysql_socket: /var/lib/mysql/mysql.sock