diff --git a/Dockerfile b/Dockerfile
index 13f440f..9c810ce 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -19,6 +19,6 @@ VOLUME ${DATA_DIR}
 EXPOSE 51826
 EXPOSE 51888
 
-CMD [ "echo", "homekit2mqtt", "-m", ${DATA_DIR}"/mapping.json", "-u", ${BROKER}, "-s", ${STORAGE_DIR}, "--insecure", "-c", ${PIN} ]
+CMD [ "echo", "homekit2mqtt", "-m", "$DATA_DIR/mapping.json", "-u", "$BROKER", "-s", "$STORAGE_DIR", "--insecure", "-c", "$PIN" ]