diff --git a/kubernetes/files/kubelet/default.pool b/kubernetes/files/kubelet/default.pool
index 98f04c5..3bf4708 100644
--- a/kubernetes/files/kubelet/default.pool
+++ b/kubernetes/files/kubelet/default.pool
@@ -10,7 +10,7 @@
 --cluster_domain={{ pool.cluster_domain }} \
 --cni-bin-dir={{ pool.apiserver.get('cni_bin_dir', '/opt/cni/bin') }} \
 --v={{ pool.get('verbosity', 2) }} \
-{%- if pool.network.engine in {'calico', 'opencontrail'} %}
+{%- if pool.network.engine in ['calico', 'opencontrail'] %}
 --network-plugin=cni \
 --network-plugin-dir=/etc/cni/net.d \
 {%- endif %}