diff --git a/defaults/main.yml b/defaults/main.yml
index 22de417..5fc05a7 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -7,6 +7,10 @@ postgresql_group: postgres
 
 postgresql_unix_socket_dir: /var/run/postgresql
 
+# Debian only. Used to generate the locales used by PostgreSQL databases.
+postgresql_locales:
+  - 'en_US.UTF-8'
+
 # Databases to ensure exist.
 postgresql_databases: []
   # - name: example
diff --git a/tasks/setup-Debian.yml b/tasks/setup-Debian.yml
index 080703f..13700d3 100644
--- a/tasks/setup-Debian.yml
+++ b/tasks/setup-Debian.yml
@@ -5,3 +5,14 @@
 - name: Ensure PostgreSQL packages are installed.
   apt: "name={{ item }} state=installed"
   with_items: "{{ postgresql_packages }}"
+
+- name: Ensure all configured locales are present.
+  locale_gen: "name={{ item }} state=present"
+  with_items: "{{ postgresql_locales }}"
+  register: locale_gen_result
+
+- name: Force-restart PostgreSQL after new locales are generated.
+  service:
+    name: "{{ postgresql_daemon }}"
+    state: restarted
+  when: locale_gen_result.changed