diff --git a/signaturepdf/docker-compose.yml b/signaturepdf/docker-compose.yml
index a4cb103..c98fd46 100644
--- a/signaturepdf/docker-compose.yml
+++ b/signaturepdf/docker-compose.yml
@@ -19,3 +19,4 @@ services:
       PDF_STORAGE_PATH: ${PDF_STORAGE_PATH}
       DISABLE_ORGANIZATION: ${DISABLE_ORGANIZATION}
       PDF_DEMO_LINK: ${PDF_DEMO_LINK}
+      DEFAULT_LANGUAGE: ${DEFAULT_LANGUAGE:-fr_FR.UTF-8}