diff --git a/containers/mautrix-signal.nix b/containers/mautrix-signal.nix
index d374120..8dce4b2 100644
--- a/containers/mautrix-signal.nix
+++ b/containers/mautrix-signal.nix
@@ -46,6 +46,7 @@ nglib.makeSystem {
                 SOCKET_PATH="/var/run/signald/signald.sock"
                 mkdir -p $(dirname $SOCKET_PATH)
 
+                export LANG=en_US.UTF-8
                 ${lib.getExe pkgs.signald} -d $DATA_DIR -s $SOCKET_PATH
               '';
       };