diff --git a/staging/src/k8s.io/kube-aggregator/pkg/apiserver/handler_proxy.go b/staging/src/k8s.io/kube-aggregator/pkg/apiserver/handler_proxy.go
index e6e30bbd44b..ee3433212c6 100644
--- a/staging/src/k8s.io/kube-aggregator/pkg/apiserver/handler_proxy.go
+++ b/staging/src/k8s.io/kube-aggregator/pkg/apiserver/handler_proxy.go
@@ -142,6 +142,7 @@ func (r *proxyHandler) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 	newReq := req.WithContext(context.Background())
 	newReq.Header = utilnet.CloneHeader(req.Header)
 	newReq.URL = location
+	newReq.Host = location.Host
 
 	if handlingInfo.proxyRoundTripper == nil {
 		proxyError(w, req, "", http.StatusNotFound)
diff --git a/staging/src/k8s.io/kube-aggregator/pkg/apiserver/handler_proxy_test.go b/staging/src/k8s.io/kube-aggregator/pkg/apiserver/handler_proxy_test.go
index 354c8d8b94a..b4ed4b77bdc 100644
--- a/staging/src/k8s.io/kube-aggregator/pkg/apiserver/handler_proxy_test.go
+++ b/staging/src/k8s.io/kube-aggregator/pkg/apiserver/handler_proxy_test.go
@@ -42,18 +42,21 @@ type targetHTTPHandler struct {
 	called  bool
 	headers map[string][]string
 	path    string
+	host    string
 }
 
 func (d *targetHTTPHandler) Reset() {
 	d.path = ""
 	d.called = false
 	d.headers = nil
+	d.host = ""
 }
 
 func (d *targetHTTPHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	d.path = r.URL.Path
 	d.called = true
 	d.headers = r.Header
+	d.host = r.Host
 	w.WriteHeader(http.StatusOK)
 }
 
@@ -313,6 +316,10 @@ func TestProxyHandler(t *testing.T) {
 				t.Errorf("%s: expected %v, got %v", name, e, a)
 				return
 			}
+			if e, a := targetServer.Listener.Addr().String(), target.host; tc.expectedCalled && !reflect.DeepEqual(e, a) {
+				t.Errorf("%s: expected %v, got %v", name, e, a)
+				return
+			}
 		}()
 	}
 }