diff --git a/pkg/master/master.go b/pkg/master/master.go
index 0ff460f5972..64b46206ca6 100644
--- a/pkg/master/master.go
+++ b/pkg/master/master.go
@@ -707,6 +707,13 @@ func (m *Master) ListThirdPartyResources() []string {
 	return result
 }
 
+func (m *Master) hasThirdPartyResourceStorage(path string) bool {
+	m.thirdPartyResourcesLock.Lock()
+	defer m.thirdPartyResourcesLock.Unlock()
+	_, found := m.thirdPartyResources[path]
+	return found
+}
+
 func (m *Master) addThirdPartyResourceStorage(path string, storage *thirdpartyresourcedataetcd.REST, apiGroup unversioned.APIGroup) {
 	m.thirdPartyResourcesLock.Lock()
 	defer m.thirdPartyResourcesLock.Unlock()
@@ -731,12 +738,19 @@ func (m *Master) InstallThirdPartyResource(rsrc *extensions.ThirdPartyResource)
 		Version: rsrc.Versions[0].Name,
 		Kind:    kind,
 	})
+	path := makeThirdPartyPath(group)
 
 	thirdparty := m.thirdpartyapi(group, kind, rsrc.Versions[0].Name, plural.Resource)
-	if err := thirdparty.InstallREST(m.HandlerContainer); err != nil {
-		glog.Fatalf("Unable to setup thirdparty api: %v", err)
+
+	// If storage exists, this group has already been added, just update
+	// the group with the new API
+	if m.hasThirdPartyResourceStorage(path) {
+		return thirdparty.UpdateREST(m.HandlerContainer)
+	}
+
+	if err := thirdparty.InstallREST(m.HandlerContainer); err != nil {
+		glog.Errorf("Unable to setup thirdparty api: %v", err)
 	}
-	path := makeThirdPartyPath(group)
 	groupVersion := unversioned.GroupVersionForDiscovery{
 		GroupVersion: group + "/" + rsrc.Versions[0].Name,
 		Version:      rsrc.Versions[0].Name,
diff --git a/pkg/master/master_test.go b/pkg/master/master_test.go
index 0c9faf4161a..a52e31ca83b 100644
--- a/pkg/master/master_test.go
+++ b/pkg/master/master_test.go
@@ -552,27 +552,77 @@ type FooList struct {
 }
 
 func initThirdParty(t *testing.T, version, name string) (*Master, *etcdtesting.EtcdTestServer, *httptest.Server, *assert.Assertions) {
+	return initThirdPartyMultiple(t, []string{version}, []string{name})
+}
+
+func initThirdPartyMultiple(t *testing.T, versions, names []string) (*Master, *etcdtesting.EtcdTestServer, *httptest.Server, *assert.Assertions) {
 	master, etcdserver, _, assert := newMaster(t)
-	api := &extensions.ThirdPartyResource{
-		ObjectMeta: api.ObjectMeta{
-			Name: name,
-		},
-		Versions: []extensions.APIVersion{
-			{
-				Name: version,
-			},
-		},
-	}
 	_, master.ServiceClusterIPRange, _ = net.ParseCIDR("10.0.0.0/24")
 
-	if !assert.NoError(master.InstallThirdPartyResource(api)) {
-		t.FailNow()
+	for ix := range names {
+		api := &extensions.ThirdPartyResource{
+			ObjectMeta: api.ObjectMeta{
+				Name: names[ix],
+			},
+			Versions: []extensions.APIVersion{
+				{
+					Name: versions[ix],
+				},
+			},
+		}
+		err := master.InstallThirdPartyResource(api)
+		if !assert.NoError(err) {
+			t.Logf("Failed to install API: %v", err)
+			t.FailNow()
+		}
 	}
 
 	server := httptest.NewServer(master.HandlerContainer.ServeMux)
 	return master, etcdserver, server, assert
 }
 
+func TestInstallMultipleAPIs(t *testing.T) {
+	names := []string{"foo.company.com", "bar.company.com"}
+	versions := []string{"v1", "v1"}
+
+	_, etcdserver, server, assert := initThirdPartyMultiple(t, versions, names)
+	defer server.Close()
+	defer etcdserver.Terminate(t)
+	for ix := range names {
+		kind, group, err := thirdpartyresourcedata.ExtractApiGroupAndKind(
+			&extensions.ThirdPartyResource{ObjectMeta: api.ObjectMeta{Name: names[ix]}})
+		assert.NoError(err, "Failed to extract group & kind")
+
+		plural, _ := meta.KindToResource(unversioned.GroupVersionKind{
+			Group:   group,
+			Version: versions[ix],
+			Kind:    kind,
+		})
+
+		resp, err := http.Get(
+			fmt.Sprintf("%s/apis/%s/%s/namespaces/default/%s", server.URL, group, versions[ix], plural.Resource))
+		if !assert.NoError(err, "Failed to do HTTP GET") {
+			return
+		}
+		defer resp.Body.Close()
+
+		assert.Equal(http.StatusOK, resp.StatusCode)
+
+		data, err := ioutil.ReadAll(resp.Body)
+		assert.NoError(err)
+
+		obj := map[string]interface{}{}
+		if err = json.Unmarshal(data, &obj); err != nil {
+			assert.NoError(err, fmt.Sprintf("unexpected error: %v", err))
+		}
+		kindOut, found := obj["kind"]
+		if !found {
+			t.Errorf("Missing 'kind' in %v", obj)
+		}
+		assert.Equal(kindOut, kind+"List")
+	}
+}
+
 func TestInstallThirdPartyAPIList(t *testing.T) {
 	for _, version := range versionsToTest {
 		testInstallThirdPartyAPIListVersion(t, version)