diff --git a/setupJenkins b/setupJenkins
index 17837e658b4df66e67001b714449a5d912679020..01920503418517f935fafac4ae4b099e33609851 100644
--- a/setupJenkins
+++ b/setupJenkins
@@ -8,7 +8,7 @@ sudo sh -c 'echo deb http://pkg.jenkins.io/debian-stable binary/ > /etc/apt/sour
 sudo apt update
 sudo apt install jenkins
 sudo gpasswd -a jenkins docker
-sudo usermod -aG docker jenkins
+sudo usermod -a -G docker jenkins
 sudo systemctl daemon-reload
 sudo systemctl restart docker
 sudo service jenkins start