diff --git a/installers/install_docker_ce.sh b/installers/install_docker_ce.sh
index 90035df..7a15d63 100755
--- a/installers/install_docker_ce.sh
+++ b/installers/install_docker_ce.sh
@@ -22,7 +22,7 @@
     sudo apt-get -qq update
     sudo apt-get install -y apt-transport-https ca-certificates software-properties-common
     curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo APT_KEY_DONT_WARN_ON_DANGEROUS_USAGE=1 apt-key add -
-    sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
+    sudo add-apt-repository -y "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
     sudo apt-get -qq update
     sudo apt-get install -y docker-ce
 #    echo "Reconfiguring Docker to use systemd as cgroup driver"
diff --git a/installers/install_kubeadm_cluster.sh b/installers/install_kubeadm_cluster.sh
index 03b7d79..0ec2a31 100755
--- a/installers/install_kubeadm_cluster.sh
+++ b/installers/install_kubeadm_cluster.sh
@@ -26,7 +26,7 @@
     sudo apt-get update && sudo apt-get install -y apt-transport-https
     sudo apt-get update && sudo apt-get install -y apt-transport-https
     curl -fsSL https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo apt-key add -
-    sudo add-apt-repository "deb https://apt.kubernetes.io/ kubernetes-xenial main"
+    sudo add-apt-repository -y "deb https://apt.kubernetes.io/ kubernetes-xenial main"
     sudo apt-get update
     echo "Installing Kubernetes Packages ..."
     sudo apt-get install -y kubelet=${K8S_VERSION} kubeadm=${K8S_VERSION} kubectl=${K8S_VERSION}