diff --git a/Dockerfile.tailscale b/Dockerfile.tailscale
index 7a3f575a..145ab6f7 100644
--- a/Dockerfile.tailscale
+++ b/Dockerfile.tailscale
@@ -1,7 +1,7 @@
 FROM ubuntu:latest
 
-ARG TAILSCALE_VERSION
-ARG TAILSCALE_CHANNEL
+ARG TAILSCALE_VERSION=*
+ARG TAILSCALE_CHANNEL=stable
 
 RUN apt-get update \
     && apt-get install -y gnupg curl \