diff --git a/cmd/controller-manager/app/options/insecure_serving.go b/cmd/controller-manager/app/options/insecure_serving.go
index ca379f1314..3f98437a6c 100644
--- a/cmd/controller-manager/app/options/insecure_serving.go
+++ b/cmd/controller-manager/app/options/insecure_serving.go
@@ -53,8 +53,8 @@ func (s *InsecureServingOptions) Validate() []error {
 
 	errors := []error{}
 
-	if s.BindPort < 0 || s.BindPort > 32767 {
-		errors = append(errors, fmt.Errorf("--insecure-port %v must be between 0 and 32767, inclusive. 0 for turning off insecure (HTTP) port", s.BindPort))
+	if s.BindPort < 0 || s.BindPort > 65335 {
+		errors = append(errors, fmt.Errorf("--insecure-port %v must be between 0 and 65535, inclusive. 0 for turning off insecure (HTTP) port", s.BindPort))
 	}
 
 	return errors