diff --git a/Dockerfile b/Dockerfile
index 91d09c5..4153558 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -14,7 +14,7 @@ ENV UID=12345
 ENV GID=23456
 
 RUN addgroup -S docker \
-   && adduser -D -g "" -h "/home/${USERhome}" -G "${USERhome}" -U "${UID}" "${USERhome}"
+   && adduser -D -g "" -h "/home/${USERhome}" -G "${USERhome}" -u "${UID}" "${USERhome}"