diff --git a/test/e2e/autoscaling/cluster_size_autoscaling.go b/test/e2e/autoscaling/cluster_size_autoscaling.go
index 41553939068..a3f0894fb1e 100644
--- a/test/e2e/autoscaling/cluster_size_autoscaling.go
+++ b/test/e2e/autoscaling/cluster_size_autoscaling.go
@@ -899,7 +899,7 @@ var _ = SIGDescribe("Cluster size autoscaling [Slow]", func() {
 		}
 
 		By("Block network connectivity to some nodes to simulate unhealthy cluster")
-		nodesToBreakCount := int(math.Floor(math.Max(float64(unhealthyClusterThreshold), 0.5*float64(clusterSize))))
+		nodesToBreakCount := int(math.Ceil(math.Max(float64(unhealthyClusterThreshold), 0.5*float64(clusterSize))))
 		nodes, err := f.ClientSet.CoreV1().Nodes().List(metav1.ListOptions{FieldSelector: fields.Set{
 			"spec.unschedulable": "false",
 		}.AsSelector().String()})