diff --git a/pkg/proxy/winkernel/BUILD b/pkg/proxy/winkernel/BUILD
index d470652ecea..0e86edc9627 100644
--- a/pkg/proxy/winkernel/BUILD
+++ b/pkg/proxy/winkernel/BUILD
@@ -25,6 +25,7 @@ go_library(
             "//pkg/util/async:go_default_library",
             "//staging/src/k8s.io/api/core/v1:go_default_library",
             "//staging/src/k8s.io/apimachinery/pkg/types:go_default_library",
+            "//staging/src/k8s.io/apimachinery/pkg/util/intstr:go_default_library",
             "//staging/src/k8s.io/apimachinery/pkg/util/sets:go_default_library",
             "//staging/src/k8s.io/apimachinery/pkg/util/wait:go_default_library",
             "//staging/src/k8s.io/apiserver/pkg/features:go_default_library",
diff --git a/pkg/proxy/winkernel/proxier.go b/pkg/proxy/winkernel/proxier.go
index d3423612c0e..feef8490c68 100644
--- a/pkg/proxy/winkernel/proxier.go
+++ b/pkg/proxy/winkernel/proxier.go
@@ -36,6 +36,7 @@ import (
 
 	"k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/types"
+	"k8s.io/apimachinery/pkg/util/intstr"
 	"k8s.io/apimachinery/pkg/util/sets"
 	"k8s.io/apimachinery/pkg/util/wait"
 	genericfeatures "k8s.io/apiserver/pkg/features"
@@ -234,14 +235,18 @@ func newServiceInfo(svcPortName proxy.ServicePortName, port *v1.ServicePort, ser
 	if err != nil {
 		preserveDIP = false
 	}
+	// targetPort is zero if it is specified as a name in port.TargetPort.
+	// Its real value would be got later from endpoints.
+	targetPort := 0
+	if port.TargetPort.Type == intstr.Int {
+		targetPort = port.TargetPort.IntValue()
+	}
 	info := &serviceInfo{
-		clusterIP: net.ParseIP(service.Spec.ClusterIP),
-		port:      int(port.Port),
-		protocol:  port.Protocol,
-		nodePort:  int(port.NodePort),
-		// targetPort is zero if it is specified as a name in port.TargetPort.
-		// Its real value would be got later from endpoints.
-		targetPort: port.TargetPort.IntValue(),
+		clusterIP:  net.ParseIP(service.Spec.ClusterIP),
+		port:       int(port.Port),
+		protocol:   port.Protocol,
+		nodePort:   int(port.NodePort),
+		targetPort: targetPort,
 		// Deep-copy in case the service instance changes
 		loadBalancerStatus:       *service.Status.LoadBalancer.DeepCopy(),
 		sessionAffinityType:      service.Spec.SessionAffinity,
diff --git a/staging/src/k8s.io/apimachinery/pkg/util/intstr/intstr.go b/staging/src/k8s.io/apimachinery/pkg/util/intstr/intstr.go
index 2df62955538..cb974dcf7c9 100644
--- a/staging/src/k8s.io/apimachinery/pkg/util/intstr/intstr.go
+++ b/staging/src/k8s.io/apimachinery/pkg/util/intstr/intstr.go
@@ -97,7 +97,8 @@ func (intstr *IntOrString) String() string {
 }
 
 // IntValue returns the IntVal if type Int, or if
-// it is a String, will attempt a conversion to int.
+// it is a String, will attempt a conversion to int,
+// returning 0 if a parsing error occurs.
 func (intstr *IntOrString) IntValue() int {
 	if intstr.Type == String {
 		i, _ := strconv.Atoi(intstr.StrVal)