diff --git a/templates/etc/mysql/conf.d/10-extra.cnf.j2 b/templates/etc/mysql/conf.d/10-extra.cnf.j2
index adc6f96..55f521b 100644
--- a/templates/etc/mysql/conf.d/10-extra.cnf.j2
+++ b/templates/etc/mysql/conf.d/10-extra.cnf.j2
@@ -3,7 +3,7 @@
 # -------------------------------------------
 
 [mysqld]
-{% for key, value in mysql_extra_configuration.iteritems() %}
+{% for key, value in mysql_extra_configuration.items() %}
 {% if value is defined or value is not none %}
 {{ key }} = {{ value }}
 {% else %}