diff --git a/internal/hns/hnspolicy.go b/internal/hns/hnspolicy.go
index 591a2631e4..84b3682184 100644
--- a/internal/hns/hnspolicy.go
+++ b/internal/hns/hnspolicy.go
@@ -21,10 +21,11 @@ const (
 )
 
 type NatPolicy struct {
-	Type         PolicyType `json:"Type"`
-	Protocol     string     `json:",omitempty"`
-	InternalPort uint16     `json:",omitempty"`
-	ExternalPort uint16     `json:",omitempty"`
+	Type                 PolicyType `json:"Type"`
+	Protocol             string     `json:",omitempty"`
+	InternalPort         uint16     `json:",omitempty"`
+	ExternalPort         uint16     `json:",omitempty"`
+	ExternalPortReserved bool       `json:",omitempty"`
 }
 
 type QosPolicy struct {
diff --git a/test/vendor/github.com/Microsoft/hcsshim/internal/hns/hnspolicy.go b/test/vendor/github.com/Microsoft/hcsshim/internal/hns/hnspolicy.go
index 591a2631e4..84b3682184 100644
--- a/test/vendor/github.com/Microsoft/hcsshim/internal/hns/hnspolicy.go
+++ b/test/vendor/github.com/Microsoft/hcsshim/internal/hns/hnspolicy.go
@@ -21,10 +21,11 @@ const (
 )
 
 type NatPolicy struct {
-	Type         PolicyType `json:"Type"`
-	Protocol     string     `json:",omitempty"`
-	InternalPort uint16     `json:",omitempty"`
-	ExternalPort uint16     `json:",omitempty"`
+	Type                 PolicyType `json:"Type"`
+	Protocol             string     `json:",omitempty"`
+	InternalPort         uint16     `json:",omitempty"`
+	ExternalPort         uint16     `json:",omitempty"`
+	ExternalPortReserved bool       `json:",omitempty"`
 }
 
 type QosPolicy struct {