diff --git a/staging/src/k8s.io/kube-aggregator/pkg/controllers/openapi/aggregator/BUILD b/staging/src/k8s.io/kube-aggregator/pkg/controllers/openapi/aggregator/BUILD
index 6db2294fa65..b177a03de8f 100644
--- a/staging/src/k8s.io/kube-aggregator/pkg/controllers/openapi/aggregator/BUILD
+++ b/staging/src/k8s.io/kube-aggregator/pkg/controllers/openapi/aggregator/BUILD
@@ -5,6 +5,7 @@ go_library(
     srcs = [
         "aggregator.go",
         "downloader.go",
+        "priority.go",
     ],
     importmap = "k8s.io/kubernetes/vendor/k8s.io/kube-aggregator/pkg/controllers/openapi/aggregator",
     importpath = "k8s.io/kube-aggregator/pkg/controllers/openapi/aggregator",
diff --git a/staging/src/k8s.io/kube-aggregator/pkg/controllers/openapi/aggregator/aggregator.go b/staging/src/k8s.io/kube-aggregator/pkg/controllers/openapi/aggregator/aggregator.go
index 27ea2b17806..ca36b8e7902 100644
--- a/staging/src/k8s.io/kube-aggregator/pkg/controllers/openapi/aggregator/aggregator.go
+++ b/staging/src/k8s.io/kube-aggregator/pkg/controllers/openapi/aggregator/aggregator.go
@@ -19,7 +19,6 @@ package aggregator
 import (
 	"fmt"
 	"net/http"
-	"sort"
 	"sync"
 	"time"
 
@@ -137,59 +136,6 @@ type openAPISpecInfo struct {
 	etag    string
 }
 
-// byPriority can be used in sort.Sort to sort specs with their priorities.
-type byPriority struct {
-	specs           []openAPISpecInfo
-	groupPriorities map[string]int32
-}
-
-func (a byPriority) Len() int      { return len(a.specs) }
-func (a byPriority) Swap(i, j int) { a.specs[i], a.specs[j] = a.specs[j], a.specs[i] }
-func (a byPriority) Less(i, j int) bool {
-	// All local specs will come first
-	if a.specs[i].apiService.Spec.Service == nil && a.specs[j].apiService.Spec.Service != nil {
-		return true
-	}
-	if a.specs[i].apiService.Spec.Service != nil && a.specs[j].apiService.Spec.Service == nil {
-		return false
-	}
-	// WARNING: This will result in not following priorities for local APIServices.
-	if a.specs[i].apiService.Spec.Service == nil {
-		// Sort local specs with their name. This is the order in the delegation chain (aggregator first).
-		return a.specs[i].apiService.Name < a.specs[j].apiService.Name
-	}
-	var iPriority, jPriority int32
-	if a.specs[i].apiService.Spec.Group == a.specs[j].apiService.Spec.Group {
-		iPriority = a.specs[i].apiService.Spec.VersionPriority
-		jPriority = a.specs[i].apiService.Spec.VersionPriority
-	} else {
-		iPriority = a.groupPriorities[a.specs[i].apiService.Spec.Group]
-		jPriority = a.groupPriorities[a.specs[j].apiService.Spec.Group]
-	}
-	if iPriority != jPriority {
-		// Sort by priority, higher first
-		return iPriority > jPriority
-	}
-	// Sort by service name.
-	return a.specs[i].apiService.Name < a.specs[j].apiService.Name
-}
-
-func sortByPriority(specs []openAPISpecInfo) {
-	b := byPriority{
-		specs:           specs,
-		groupPriorities: map[string]int32{},
-	}
-	for _, spec := range specs {
-		if spec.apiService.Spec.Service == nil {
-			continue
-		}
-		if pr, found := b.groupPriorities[spec.apiService.Spec.Group]; !found || spec.apiService.Spec.GroupPriorityMinimum > pr {
-			b.groupPriorities[spec.apiService.Spec.Group] = spec.apiService.Spec.GroupPriorityMinimum
-		}
-	}
-	sort.Sort(b)
-}
-
 // buildOpenAPISpec aggregates all OpenAPI specs.  It is not thread-safe. The caller is responsible to hold proper locks.
 func (s *specAggregator) buildOpenAPISpec() (specToReturn *spec.Swagger, err error) {
 	specs := []openAPISpecInfo{}
diff --git a/staging/src/k8s.io/kube-aggregator/pkg/controllers/openapi/aggregator/priority.go b/staging/src/k8s.io/kube-aggregator/pkg/controllers/openapi/aggregator/priority.go
new file mode 100644
index 00000000000..9847de3c6c6
--- /dev/null
+++ b/staging/src/k8s.io/kube-aggregator/pkg/controllers/openapi/aggregator/priority.go
@@ -0,0 +1,74 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package aggregator
+
+import (
+	"sort"
+)
+
+// byPriority can be used in sort.Sort to sort specs with their priorities.
+type byPriority struct {
+	specs           []openAPISpecInfo
+	groupPriorities map[string]int32
+}
+
+func (a byPriority) Len() int      { return len(a.specs) }
+func (a byPriority) Swap(i, j int) { a.specs[i], a.specs[j] = a.specs[j], a.specs[i] }
+func (a byPriority) Less(i, j int) bool {
+	// All local specs will come first
+	if a.specs[i].apiService.Spec.Service == nil && a.specs[j].apiService.Spec.Service != nil {
+		return true
+	}
+	if a.specs[i].apiService.Spec.Service != nil && a.specs[j].apiService.Spec.Service == nil {
+		return false
+	}
+	// WARNING: This will result in not following priorities for local APIServices.
+	if a.specs[i].apiService.Spec.Service == nil {
+		// Sort local specs with their name. This is the order in the delegation chain (aggregator first).
+		return a.specs[i].apiService.Name < a.specs[j].apiService.Name
+	}
+	var iPriority, jPriority int32
+	if a.specs[i].apiService.Spec.Group == a.specs[j].apiService.Spec.Group {
+		iPriority = a.specs[i].apiService.Spec.VersionPriority
+		jPriority = a.specs[i].apiService.Spec.VersionPriority
+	} else {
+		iPriority = a.groupPriorities[a.specs[i].apiService.Spec.Group]
+		jPriority = a.groupPriorities[a.specs[j].apiService.Spec.Group]
+	}
+	if iPriority != jPriority {
+		// Sort by priority, higher first
+		return iPriority > jPriority
+	}
+	// Sort by service name.
+	return a.specs[i].apiService.Name < a.specs[j].apiService.Name
+}
+
+func sortByPriority(specs []openAPISpecInfo) {
+	b := byPriority{
+		specs:           specs,
+		groupPriorities: map[string]int32{},
+	}
+	for _, spec := range specs {
+		if spec.apiService.Spec.Service == nil {
+			continue
+		}
+		if pr, found := b.groupPriorities[spec.apiService.Spec.Group]; !found || spec.apiService.Spec.GroupPriorityMinimum > pr {
+			b.groupPriorities[spec.apiService.Spec.Group] = spec.apiService.Spec.GroupPriorityMinimum
+		}
+	}
+	sort.Sort(b)
+}