diff --git a/roles/docker-matrix/templates/docker-compose.yml.j2 b/roles/docker-matrix/templates/docker-compose.yml.j2
index 2f39d90f..566d4e11 100644
--- a/roles/docker-matrix/templates/docker-compose.yml.j2
+++ b/roles/docker-matrix/templates/docker-compose.yml.j2
@@ -30,7 +30,7 @@ services:
       - POSTGRES_DB=matrix
       - POSTGRES_USER=matrix
       - POSTGRES_PASSWORD={{matrix_database_password}}
-      - POSTGRES_INITDB_ARGS='--encoding=UTF-8 --lc-collate=C --lc-ctype=C'
+      - POSTGRES_INITDB_ARGS=--encoding=UTF8 --locale=C
     healthcheck:
       test: ["CMD-SHELL", "pg_isready -U matrix"]
       interval: 10s