diff --git a/k8s/apps/matrix/matrix-stack-values.yaml b/k8s/apps/matrix/matrix-stack-values.yaml
index e3b3627..111ffc7 100644
--- a/k8s/apps/matrix/matrix-stack-values.yaml
+++ b/k8s/apps/matrix/matrix-stack-values.yaml
@@ -35,6 +35,11 @@ synapse:
     password:
       secret: matrix-postgres-creds
       secretKey: synapse_db_password
+  additional:
+    0-unsafe-locale:
+      config: |
+        database:
+          allow_unsafe_locale: true
   media:
     storage:
       size: 20Gi