diff --git a/tcp_tests/managers/k8smanager.py b/tcp_tests/managers/k8smanager.py
index 5f5f4e8..c3922db 100644
--- a/tcp_tests/managers/k8smanager.py
+++ b/tcp_tests/managers/k8smanager.py
@@ -69,7 +69,7 @@
             "expected one!").format(k8s_hosts)
         k8s_host = k8s_hosts.pop()
         assert k8s_host in k8s_proxy_ip, (
-            "Kubernetes API host:{0} not found in proxies:{} "
+            "Kubernetes API host:{0} not found in proxies:{1} "
             "on k8s master nodes. K8s proxies are expected on "
             "nodes with K8s master").format(k8s_host, k8s_proxy_ip)
         return k8s_host