diff --git a/test/840_weave_kube_3_test.sh b/test/840_weave_kube_3_test.sh
index e8c6a238..adbc9d4c 100755
--- a/test/840_weave_kube_3_test.sh
+++ b/test/840_weave_kube_3_test.sh
@@ -36,7 +36,7 @@ for host in $HOSTS; do
     if [ $host = $HOST1 ] ; then
 	run_on $host "sudo systemctl start kubelet && sudo kubeadm init --$k8s_version_option=$k8s_version --token=$TOKEN --pod-network-cidr=$WEAVE_NETWORK"
     else
-	run_on $host "sudo systemctl start kubelet && sudo kubeadm join --token=$TOKEN $HOST1IP:$KUBE_PORT"
+	run_on $host "sudo systemctl start kubelet && sudo kubeadm join --token=$TOKEN --discovery-token-unsafe-skip-ca-verification $HOST1IP:$KUBE_PORT"
     fi
 done
 
diff --git a/test/870_weave_recovers_unreachable_ips_on_relaunch_3_test.sh b/test/870_weave_recovers_unreachable_ips_on_relaunch_3_test.sh
index 19d22592..ea7ba401 100755
--- a/test/870_weave_recovers_unreachable_ips_on_relaunch_3_test.sh
+++ b/test/870_weave_recovers_unreachable_ips_on_relaunch_3_test.sh
@@ -44,7 +44,7 @@ function setup_kubernetes_cluster {
         if [ $host = $HOST1 ] ; then
         run_on $host "sudo systemctl start kubelet && sudo kubeadm init --$k8s_version_option=$k8s_version --token=$TOKEN"
         else
-        run_on $host "sudo systemctl start kubelet && sudo kubeadm join --token=$TOKEN $HOST1IP:$KUBE_PORT"
+        run_on $host "sudo systemctl start kubelet && sudo kubeadm join --token=$TOKEN --discovery-token-unsafe-skip-ca-verification $HOST1IP:$KUBE_PORT"
         fi
     done