diff --git a/src/app/frontend/replicationcontrollerdetail/updatereplicas.html b/src/app/frontend/replicationcontrollerdetail/updatereplicas.html
index 025e11017541..4899ad7f96b8 100644
--- a/src/app/frontend/replicationcontrollerdetail/updatereplicas.html
+++ b/src/app/frontend/replicationcontrollerdetail/updatereplicas.html
@@ -18,16 +18,21 @@
   <md-dialog-content layout-padding>
     <h4 class="md-title">Set desired number of pods</h4>
     <div>
-      Replication controller {{ctrl.replicationController}} will be updated to reflect the desired count.<br/>
+      Replication controller {{ctrl.replicationController}} will be updated to reflect the desired
+      count.<br/>
       <span class="kd-updatereplicas-pod-status">
-        Current status: {{ctrl.currentPods}}
-        created, {{ctrl.desiredPods}} desired
+        Current status: {{ctrl.currentPods}} created, {{ctrl.desiredPods}} desired
       </span>
     </div>
-    <form ng-submit="ctrl.updateReplicas()">
+    <form name="ctrl.updateReplicasForm" ng-submit="ctrl.updateReplicas()" novalidate>
       <md-input-container class="md-block">
         <label>Number of pods</label>
-        <input type="number" min="1" ng-model="ctrl.replicas" required>
+        <input name="podCount" type="number" kd-validate="integer" min="1" ng-model="ctrl.replicas"
+               required>
+        <ng-messages for="ctrl.updateReplicasForm.podCount.$error" role="alert">
+          <ng-message when="required">Number of pods is required.</ng-message>
+          <ng-message when="number,kdValid">Must be a positive integer.</ng-message>
+        </ng-messages>
       </md-input-container>
       <md-dialog-actions layout="row">
         <md-button class="md-primary" ng-click="ctrl.cancel()">Cancel</md-button>
diff --git a/src/app/frontend/replicationcontrollerdetail/updatereplicas_controller.js b/src/app/frontend/replicationcontrollerdetail/updatereplicas_controller.js
index 110ce4344b6f..b189729a01bd 100644
--- a/src/app/frontend/replicationcontrollerdetail/updatereplicas_controller.js
+++ b/src/app/frontend/replicationcontrollerdetail/updatereplicas_controller.js
@@ -61,6 +61,9 @@ export default class UpdateReplicasDialogController {
 
     /** @private {!angular.$resource} */
     this.resource_ = $resource;
+
+    /** @export {!angular.FormController} Initialized from the template */
+    this.updateReplicasForm;
   }
 
   /**
@@ -69,17 +72,19 @@ export default class UpdateReplicasDialogController {
    * @export
    */
   updateReplicas() {
-    let resource = getReplicationControllerSpecPodsResource(
-        new StateParams(this.namespace_, this.replicationController), this.resource_);
-
-    /** @type {!backendApi.ReplicationControllerSpec} */
-    let replicationControllerSpec = {
-      replicas: this.replicas,
-    };
-
-    resource.save(
-        replicationControllerSpec, this.onUpdateReplicasSuccess_.bind(this),
-        this.onUpdateReplicasError_.bind(this));
+    if (this.updateReplicasForm.$valid) {
+      let resource = getReplicationControllerSpecPodsResource(
+          new StateParams(this.namespace_, this.replicationController), this.resource_);
+
+      /** @type {!backendApi.ReplicationControllerSpec} */
+      let replicationControllerSpec = {
+        replicas: this.replicas,
+      };
+
+      resource.save(
+          replicationControllerSpec, this.onUpdateReplicasSuccess_.bind(this),
+          this.onUpdateReplicasError_.bind(this));
+    }
   }
 
   /**
diff --git a/src/test/frontend/replicationcontrollerdetail/updatereplicas_controller_test.js b/src/test/frontend/replicationcontrollerdetail/updatereplicas_controller_test.js
index cfdd88ea8ea0..dea7883aa8fd 100644
--- a/src/test/frontend/replicationcontrollerdetail/updatereplicas_controller_test.js
+++ b/src/test/frontend/replicationcontrollerdetail/updatereplicas_controller_test.js
@@ -47,13 +47,15 @@ describe('Update Replicas controller', () => {
       httpBackend = $httpBackend;
       log = $log;
 
-      ctrl = $controller(UpdateReplicasDialogController, {
-        $resource: resource,
-        namespace: namespaceMock,
-        replicationController: replicationControllerMock,
-        currentPods: 1,
-        desiredPods: 1,
-      });
+      ctrl = $controller(
+          UpdateReplicasDialogController, {
+            $resource: resource,
+            namespace: namespaceMock,
+            replicationController: replicationControllerMock,
+            currentPods: 1,
+            desiredPods: 1,
+          },
+          {updateReplicasForm: {$valid: true}});
     });
   });