diff --git a/docker-compose.yaml b/docker-compose.yaml
index d4ba4b316b41952af93aac0b0d0769e6b38990f5..e9d5927bd07e22d22cb421a5f36e3deccca75367 100644
--- a/docker-compose.yaml
+++ b/docker-compose.yaml
@@ -74,7 +74,7 @@ services:
       OPENTALK_CTRL_CALL_IN__TEL: "${OPENTALK_CTRL_CALL_IN__TEL:-}"
       OPENTALK_CTRL_CALL_IN__DEFAULT_COUNTRY_CODE: "${OPENTALK_CTRL_CALL_IN__DEFAULT_COUNTRY_CODE:-DE}"
       OPENTALK_CTRL_CALL_IN__ENABLE_PHONE_MAPPING: "${OPENTALK_CTRL_CALL_IN__ENABLE_PHONE_MAPPING:-false}"
-      OPENTALK_CTRL_SUBROOM_AUDIO__ENABLE_WHISPER: "true"
+      OPENTALK_CTRL_SUBROOM_AUDIO__ENABLE_WHISPER: "${OPENTALK_CTRL_SUBROOM_AUDIO__ENABLE_WHISPER:-false}"
     volumes:
       - ${OPENTALK_CONTROLLER_CONFIG_FILE:-./config/controller.toml}:/controller/config.toml