diff --git a/config/services/synapse.nix b/config/services/synapse.nix
index 96d2b729..e9e5030c 100644
--- a/config/services/synapse.nix
+++ b/config/services/synapse.nix
@@ -25,6 +25,7 @@
           user = "matrix-synapse";
           database = "synapse";
         };
+        allow_unsafe_locale = true; # shut up
       };
       enable_media_repo = false;
       url_preview_enabled = true;