diff --git a/pkg/api/testing/defaulting_test.go b/pkg/api/testing/defaulting_test.go
index 6c1c2af86f8..4ac2d1c5dab 100644
--- a/pkg/api/testing/defaulting_test.go
+++ b/pkg/api/testing/defaulting_test.go
@@ -145,6 +145,7 @@ func TestDefaulting(t *testing.T) {
 		{Group: "storage.k8s.io", Version: "v1beta1", Kind: "StorageClassList"}:                                 {},
 		{Group: "storage.k8s.io", Version: "v1", Kind: "StorageClass"}:                                          {},
 		{Group: "storage.k8s.io", Version: "v1", Kind: "StorageClassList"}:                                      {},
+		{Group: "authentication.k8s.io", Version: "v1", Kind: "TokenRequest"}:                                   {},
 	}
 
 	f := fuzz.New().NilChance(.5).NumElements(1, 1).RandSource(rand.NewSource(1))
diff --git a/pkg/apis/authentication/v1/defaults.go b/pkg/apis/authentication/v1/defaults.go
index 074e15baedb..b9448624ee2 100644
--- a/pkg/apis/authentication/v1/defaults.go
+++ b/pkg/apis/authentication/v1/defaults.go
@@ -17,9 +17,17 @@ limitations under the License.
 package v1
 
 import (
+	authenticationv1 "k8s.io/api/authentication/v1"
 	"k8s.io/apimachinery/pkg/runtime"
 )
 
 func addDefaultingFuncs(scheme *runtime.Scheme) error {
 	return RegisterDefaults(scheme)
 }
+
+func SetDefaults_TokenRequestSpec(obj *authenticationv1.TokenRequestSpec) {
+	if obj.ExpirationSeconds == nil {
+		hour := int64(60 * 60)
+		obj.ExpirationSeconds = &hour
+	}
+}
diff --git a/pkg/apis/authentication/v1/zz_generated.defaults.go b/pkg/apis/authentication/v1/zz_generated.defaults.go
index 88d7af085be..6193cc5cc1d 100644
--- a/pkg/apis/authentication/v1/zz_generated.defaults.go
+++ b/pkg/apis/authentication/v1/zz_generated.defaults.go
@@ -21,6 +21,7 @@ limitations under the License.
 package v1
 
 import (
+	v1 "k8s.io/api/authentication/v1"
 	runtime "k8s.io/apimachinery/pkg/runtime"
 )
 
@@ -28,5 +29,10 @@ import (
 // Public to allow building arbitrary schemes.
 // All generated defaulters are covering - they call all nested defaulters.
 func RegisterDefaults(scheme *runtime.Scheme) error {
+	scheme.AddTypeDefaultingFunc(&v1.TokenRequest{}, func(obj interface{}) { SetObjectDefaults_TokenRequest(obj.(*v1.TokenRequest)) })
 	return nil
 }
+
+func SetObjectDefaults_TokenRequest(in *v1.TokenRequest) {
+	SetDefaults_TokenRequestSpec(&in.Spec)
+}