diff --git a/spoke/Dockerfile b/spoke/Dockerfile
index 0a36f79..a4be890 100644
--- a/spoke/Dockerfile
+++ b/spoke/Dockerfile
@@ -5,7 +5,7 @@ RUN echo "PermitRootLogin no" >> /etc/ssh/sshd_config
 RUN echo "PasswordAuthentication no" >> /etc/ssh/sshd_config
 RUN echo "Subsystem sftp internal-sftp" >> /etc/ssh/sshd_config
 
-RG UID=1000
+ARG UID=1000
 ARG GID=1000
 RUN groupadd -g ${GID} armbian && useradd -m -u ${UID} -g armbian armbian
 USER armbian