diff --git a/entrypoint-user.sh b/entrypoint-user.sh
index debc3af..e7d0b86 100755
--- a/entrypoint-user.sh
+++ b/entrypoint-user.sh
@@ -12,6 +12,9 @@ exit_handler_user() {
 echo -e "Loading exit handler"
 trap exit_handler_user SIGQUIT SIGINT SIGTERM
 
+# Define ${USER} as missing in docker container
+USER="${USERNAME}"
+
 # Setup game server
 if [ ! -f "${GAMESERVER}" ]; then
   echo -e ""