diff --git a/roles/kubernetes/master/templates/kubeadm-config.v1beta2.yaml.j2 b/roles/kubernetes/master/templates/kubeadm-config.v1beta2.yaml.j2
index 25a71c073..d8f8ada7a 100644
--- a/roles/kubernetes/master/templates/kubeadm-config.v1beta2.yaml.j2
+++ b/roles/kubernetes/master/templates/kubeadm-config.v1beta2.yaml.j2
@@ -158,7 +158,7 @@ apiServer:
     encryption-provider-config: {{ kube_cert_dir }}/secrets_encryption.yaml
 {% endif %}
     storage-backend: {{ kube_apiserver_storage_backend }}
-{% if kube_api_runtime_config is defined %}
+{% if kube_api_runtime_config|length > 0 %}
     runtime-config: {{ kube_api_runtime_config | join(',') }}
 {% endif %}
     allow-privileged: "true"