diff --git a/roles/network_plugin/calico/tasks/check.yml b/roles/network_plugin/calico/tasks/check.yml
index a0a656707bf..8d72448b810 100644
--- a/roles/network_plugin/calico/tasks/check.yml
+++ b/roles/network_plugin/calico/tasks/check.yml
@@ -53,7 +53,7 @@
 - name: "Check if inventory match current cluster configuration"
   assert:
     that:
-      - calico_pool_conf.spec.blockSize == (calico_pool_blocksize | default(kube_network_node_prefix))
+      - calico_pool_conf.spec.blockSize|string == (calico_pool_blocksize | default(kube_network_node_prefix | string))
       - calico_pool_conf.spec.cidr == (calico_pool_cidr | default(kube_pods_subnet))
       - not calico_pool_conf.spec.ipipMode is defined or calico_pool_conf.spec.ipipMode == calico_ipip_mode
       - not calico_pool_conf.spec.vxlanMode is defined or calico_pool_conf.spec.vxlanMode == calico_vxlan_mode