diff --git a/roles/matrix/tasks/main.yml b/roles/matrix/tasks/main.yml
index 2296383b39ec7cb0c74ec4bf6ee3368aec6f66eb..28099e972ce2cdc5151e54e3a6a597822e3d47a9 100644
--- a/roles/matrix/tasks/main.yml
+++ b/roles/matrix/tasks/main.yml
@@ -172,7 +172,7 @@
     - restart postgres
 
 - name: add synapse postgres db
-  postgresql_db: db=synapse
+  postgresql_db: db=synapse lc_collate=C lc_ctype=C template=template0
   become: true
   become_user: postgres
   become_method: su