diff --git a/docker/supervisord.conf b/docker/supervisord.conf
index 0e7d814..c2e8ea7 100644
--- a/docker/supervisord.conf
+++ b/docker/supervisord.conf
@@ -61,7 +61,10 @@ directory=/app
 ; HF_HUB_OFFLINE/TRANSFORMERS_OFFLINE force pure-cache reads: the pinned old
 ; transformers/huggingface_hub otherwise retry the network on every load and
 ; error out instead of falling back to the (complete) baked cache.
-environment=MELO_LANGUAGE="KR",MELO_SPEED="1.5",MELO_DEVICE="cpu",MELO_WORKER_HOST="127.0.0.1",MELO_WORKER_PORT="8770",HF_HOME="/opt/melo-cache",HF_HUB_OFFLINE="1",TRANSFORMERS_OFFLINE="1"
+; MELO_DEVICE inherits from the container env (compose sets it; default cuda)
+; so the worker runs MeloTTS on the GPU. supervisord interpolates %(ENV_x)s
+; from its own environment, which is the container's.
+environment=MELO_LANGUAGE="KR",MELO_SPEED="1.5",MELO_DEVICE="%(ENV_MELO_DEVICE)s",MELO_WORKER_HOST="127.0.0.1",MELO_WORKER_PORT="8770",HF_HOME="/opt/melo-cache",HF_HUB_OFFLINE="1",TRANSFORMERS_OFFLINE="1"
 priority=280
 autorestart=true
 stdout_logfile=/dev/stdout