diff --git a/controllers/pravega_controller.go b/controllers/pravega_controller.go
index ea21c901d..7f776c387 100644
--- a/controllers/pravega_controller.go
+++ b/controllers/pravega_controller.go
@@ -403,7 +403,13 @@ func MakeControllerService(p *api.PravegaCluster) *corev1.Service {
 }
 
 func MakeControllerPodDisruptionBudget(p *api.PravegaCluster) *policyv1beta1.PodDisruptionBudget {
-	minAvailable := intstr.FromInt(int(p.Spec.Pravega.MaxUnavailableControllerReplicas))
+	var maxUnavailable intstr.IntOrString
+
+	if p.Spec.Pravega.MaxUnavailableControllerReplicas == int32(1) {
+		maxUnavailable = intstr.FromInt(0)
+	} else {
+		maxUnavailable = intstr.FromInt(int(p.Spec.Pravega.MaxUnavailableControllerReplicas))
+	}
 	return &policyv1beta1.PodDisruptionBudget{
 		TypeMeta: metav1.TypeMeta{
 			Kind:       "PodDisruptionBudget",
@@ -414,7 +420,7 @@ func MakeControllerPodDisruptionBudget(p *api.PravegaCluster) *policyv1beta1.Pod
 			Namespace: p.Namespace,
 		},
 		Spec: policyv1beta1.PodDisruptionBudgetSpec{
-			MinAvailable: &minAvailable,
+			MaxUnavailable: &maxUnavailable,
 			Selector: &metav1.LabelSelector{
 				MatchLabels: p.LabelsForController(),
 			},