diff --git a/minimal/modules/onkofdz-compose.yml b/minimal/modules/onkofdz-compose.yml
index c8db300..d019c08 100644
--- a/minimal/modules/onkofdz-compose.yml
+++ b/minimal/modules/onkofdz-compose.yml
@@ -11,7 +11,7 @@ services:
       ALL_PROXY: http://forward_proxy:3128
       TLS_CA_CERTIFICATES_DIR: /conf/trusted-ca-certs
       ROOTCERT_FILE: /conf/root.crt.pem
-      app_beamsel_key: ${BEAMSEL_SECRET}
+      APP_beamsel_KEY: ${BEAMSEL_SECRET}
     secrets:
       - proxy.pem
     depends_on: