diff --git a/tests/group_vars/all b/tests/group_vars/all.yml
similarity index 97%
rename from tests/group_vars/all
rename to tests/group_vars/all.yml
index eb80c13..9d27d19 100644
--- a/tests/group_vars/all
+++ b/tests/group_vars/all.yml
@@ -1,3 +1,5 @@
+---
+
 mariadb_bind_address: '0.0.0.0'
 mariadb_extra_configuration:
   innodb_commit_concurrency: 0
diff --git a/tests/group_vars/galera b/tests/group_vars/galera.yml
similarity index 98%
rename from tests/group_vars/galera
rename to tests/group_vars/galera.yml
index 13f495d..8bd732f 100644
--- a/tests/group_vars/galera
+++ b/tests/group_vars/galera.yml
@@ -1,3 +1,5 @@
+---
+
 mariadb_use_galera: true
 mariadb_galera_members:
   - '{% if is_docker %}docker-{% else %}vbox-{% endif %}{{ ansible_distribution_release }}-{{ mariadb_origin }}-galera-1'
diff --git a/tests/group_vars/master b/tests/group_vars/master.yml
similarity index 98%
rename from tests/group_vars/master
rename to tests/group_vars/master.yml
index f71e8c5..c2571cc 100644
--- a/tests/group_vars/master
+++ b/tests/group_vars/master.yml
@@ -1,3 +1,5 @@
+---
+
 # Master durability
 mariadb_sync_binlog: '1'
 mariadb_innodb_flush_log_at_trx_commit: '1'
diff --git a/tests/group_vars/slave b/tests/group_vars/slave.yml
similarity index 97%
rename from tests/group_vars/slave
rename to tests/group_vars/slave.yml
index c9efd22..b325ce0 100644
--- a/tests/group_vars/slave
+++ b/tests/group_vars/slave.yml
@@ -1,3 +1,5 @@
+---
+
 mariadb_replication_master: false
 mariadb_replication_slave: true
 mariadb_replication_user: 'replication'