diff --git a/docker/Dockerfile b/docker/Dockerfile
index dc43100..b31eafb 100644
--- a/docker/Dockerfile
+++ b/docker/Dockerfile
@@ -9,7 +9,7 @@ RUN apt-get -y install ruby
 RUN apt-get -y install nodejs
 RUN apt-get -y install golang
 
-RUN useradd runner root
+RUN useradd -g root runner
 
 RUN echo '@runner soft nproc 16' >> /etc/security/limits.conf
 RUN echo '@runner hard nproc 16' >> /etc/security/limits.conf