diff --git a/Dockerfile b/Dockerfile
index 1612535..af52a58 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,7 +3,7 @@ MAINTAINER Team Lixo <lixonet@team.lixo>
 
 RUN apk add gnupg curl git py-pip openssh bash && pip install netcalc
 RUN curl -L "https://github.com/gliderlabs/sigil/releases/download/v0.5.0/sigil_0.5.0_$(uname -sm|tr \  _).tgz" | tar -zxC /usr/local/bin
-RUN adduser -u 431 -g docker -s /sbin/nologin -D lixonet
+RUN adduser -u 431 -G docker -s /sbin/nologin -D lixonet
 
 VOLUME /etc/lixonet