diff --git a/pkg/apis/extensions/types.go b/pkg/apis/extensions/types.go
index 51559115777..c6aed011b52 100644
--- a/pkg/apis/extensions/types.go
+++ b/pkg/apis/extensions/types.go
@@ -201,9 +201,6 @@ type ThirdPartyResourceList struct {
 type APIVersion struct {
 	// Name of this version (e.g. 'v1').
 	Name string `json:"name,omitempty"`
-
-	// The API group to add this object into, default 'experimental'.
-	APIGroup string `json:"apiGroup,omitempty"`
 }
 
 // An internal object, used for versioned storage in etcd.  Not exposed to the end user.
diff --git a/pkg/apis/extensions/v1beta1/types.go b/pkg/apis/extensions/v1beta1/types.go
index e0f37199ada..da2e1971006 100644
--- a/pkg/apis/extensions/v1beta1/types.go
+++ b/pkg/apis/extensions/v1beta1/types.go
@@ -198,9 +198,6 @@ type ThirdPartyResourceList struct {
 type APIVersion struct {
 	// Name of this version (e.g. 'v1').
 	Name string `json:"name,omitempty"`
-
-	// The API group to add this object into, default 'experimental'.
-	APIGroup string `json:"apiGroup,omitempty"`
 }
 
 // An internal object, used for versioned storage in etcd.  Not exposed to the end user.
diff --git a/pkg/master/master.go b/pkg/master/master.go
index d062c570b0e..3db5536e663 100644
--- a/pkg/master/master.go
+++ b/pkg/master/master.go
@@ -663,7 +663,7 @@ func (m *Master) thirdpartyapi(group, kind, version string) *apiserver.APIGroupV
 // getExperimentalResources returns the resources for extensions api
 func (m *Master) getExtensionResources(c *Config) map[string]rest.Storage {
 	// All resources except these are disabled by default.
-	enabledResources := sets.NewString("daemonsets", "deployments", "horizontalpodautoscalers", "ingresses", "jobs", "replicasets")
+	enabledResources := sets.NewString("daemonsets", "deployments", "horizontalpodautoscalers", "ingresses", "jobs", "replicasets", "thirdpartyresources")
 	resourceOverrides := m.ApiGroupVersionOverrides["extensions/v1beta1"].ResourceOverrides
 	isEnabled := func(resource string) bool {
 		// Check if the resource has been overriden.