diff --git a/docker/Dockerfile-steam b/docker/Dockerfile-steam
index d2357a7..13287c7 100644
--- a/docker/Dockerfile-steam
+++ b/docker/Dockerfile-steam
@@ -4,7 +4,6 @@ FROM jlesage/baseimage-gui:debian-11
 ARG STEAM_USER
 ARG STEAM_PASS
 ARG SRCDS_APPID # Steam appId
-ARG STEAM_GUARD
 
 # Set the name of the application.
 ENV APP_NAME="StardewValley"
@@ -25,6 +24,10 @@ RUN wget https://steamcdn-a.akamaihd.net/client/installer/steamcmd_linux.tar.gz
     tar -xzvf steamcmd.tar.gz -C /data/steamcmd && \
     cd /data/steamcmd
 
+## Don't set the arg earlier, if you need to rebuild the container
+## it will cache up to here when you change the ENV VAR
+ARG STEAM_GUARD
+
 RUN chown -R 1000:1000 /data && \
     export HOME=/data && \
     /data/steamcmd/steamcmd.sh +force_install_dir /data/Stardew +login ${STEAM_USER} ${STEAM_PASS} ${STEAM_GUARD} +app_update ${SRCDS_APPID} validate +quit