diff --git a/postgresql/defaults/main.yml b/postgresql/defaults/main.yml
index 3e4edb68..2c46becf 100644
--- a/postgresql/defaults/main.yml
+++ b/postgresql/defaults/main.yml
@@ -35,7 +35,7 @@ psql_conf_parameters:
 psql_log_configuration:
   - { name: 'log_destination', value: 'stderr', set: 'True' }
   - { name: 'logging_collector', value: 'off', set: 'False' }
-  - { name: 'log_directory', value: '{{ psql_log_dir }}', set: 'True' }
+  - { name: 'log_directory', value: "'{{ psql_log_dir }}'", set: 'True' }
   - { name: 'log_rotation_age', value: '1d', set: 'True' }
   - { name: 'log_rotation_size', value: '10MB', set: 'True' }
   - { name: 'client_min_messages', value: 'notice', set: 'True' }