diff --git a/galera/files/my.cnf b/galera/files/my.cnf
index 7168e06..b55530f 100644
--- a/galera/files/my.cnf
+++ b/galera/files/my.cnf
@@ -43,9 +43,9 @@
 myisam_sort_buffer_size=64M
 wait_timeout=1800
 open_files_limit=102400
-table_open_cache={{ service.table_open_cache|default(10000) }}
-tmp_table_size ={{ service.tmp_table_size|default(16777216) }}
-max_heap_table_size={{ service.max_heap_table_size|default(16777216) }}
+table_open_cache={{ service.get('table_open_cache', 10000) }}
+tmp_table_size={{ service.get('tmp_table_size', 16777216) }}
+max_heap_table_size={{ service.get('max_heap_table_size', 16777216) }}
 key_buffer_size=64M
 max_allowed_packet=256M
 query_cache_size=0