diff --git a/staging/src/k8s.io/kube-aggregator/pkg/controllers/status/BUILD b/staging/src/k8s.io/kube-aggregator/pkg/controllers/status/BUILD
index 5ec5d75b3b9..1026e9bd86a 100644
--- a/staging/src/k8s.io/kube-aggregator/pkg/controllers/status/BUILD
+++ b/staging/src/k8s.io/kube-aggregator/pkg/controllers/status/BUILD
@@ -19,6 +19,7 @@ go_library(
         "//staging/src/k8s.io/apimachinery/pkg/api/equality:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/api/errors:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/api/meta:go_default_library",
+        "//staging/src/k8s.io/apimachinery/pkg/apis/meta/v1:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/labels:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/runtime:go_default_library",
         "//staging/src/k8s.io/apimachinery/pkg/util/runtime:go_default_library",
diff --git a/staging/src/k8s.io/kube-aggregator/pkg/controllers/status/available_controller.go b/staging/src/k8s.io/kube-aggregator/pkg/controllers/status/available_controller.go
index 6bcad90bd39..364e00ae9fb 100644
--- a/staging/src/k8s.io/kube-aggregator/pkg/controllers/status/available_controller.go
+++ b/staging/src/k8s.io/kube-aggregator/pkg/controllers/status/available_controller.go
@@ -29,6 +29,7 @@ import (
 	"k8s.io/apimachinery/pkg/api/equality"
 	apierrors "k8s.io/apimachinery/pkg/api/errors"
 	"k8s.io/apimachinery/pkg/api/meta"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/labels"
 	"k8s.io/apimachinery/pkg/runtime"
 	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
@@ -151,8 +152,9 @@ func (c *AvailableConditionController) sync(key string) error {
 	apiService := originalAPIService.DeepCopy()
 
 	availableCondition := apiregistration.APIServiceCondition{
-		Type:   apiregistration.Available,
-		Status: apiregistration.ConditionTrue,
+		Type:               apiregistration.Available,
+		Status:             apiregistration.ConditionTrue,
+		LastTransitionTime: metav1.Now(),
 	}
 
 	// local API services are always considered available
diff --git a/staging/src/k8s.io/kube-aggregator/pkg/controllers/status/available_controller_test.go b/staging/src/k8s.io/kube-aggregator/pkg/controllers/status/available_controller_test.go
index 895cc9a74b6..5feec0e183e 100644
--- a/staging/src/k8s.io/kube-aggregator/pkg/controllers/status/available_controller_test.go
+++ b/staging/src/k8s.io/kube-aggregator/pkg/controllers/status/available_controller_test.go
@@ -228,6 +228,9 @@ func TestSync(t *testing.T) {
 		if e, a := tc.expectedAvailability.Message, condition.Message; e != a {
 			t.Errorf("%v expected %v, got %#v", tc.name, e, condition)
 		}
+		if condition.LastTransitionTime.IsZero() {
+			t.Error("expected lastTransitionTime to be non-zero")
+		}
 	}
 }