diff --git a/pkg/api/validation/validation.go b/pkg/api/validation/validation.go
index 56ac14ee6cb..d0b601b7b50 100644
--- a/pkg/api/validation/validation.go
+++ b/pkg/api/validation/validation.go
@@ -1028,6 +1028,8 @@ func validateServicePort(sp *api.ServicePort, requireName bool, allNames *util.S
 			allErrs = append(allErrs, errs.NewFieldInvalid("name", sp.Name, dns1123LabelErrorMsg))
 		} else if allNames.Has(sp.Name) {
 			allErrs = append(allErrs, errs.NewFieldDuplicate("name", sp.Name))
+		} else {
+			allNames.Insert(sp.Name)
 		}
 	}
 
diff --git a/pkg/api/validation/validation_test.go b/pkg/api/validation/validation_test.go
index e4b1b1f3da4..54278a9a94c 100644
--- a/pkg/api/validation/validation_test.go
+++ b/pkg/api/validation/validation_test.go
@@ -1682,7 +1682,7 @@ func TestValidateService(t *testing.T) {
 			name: "dup port name",
 			tweakSvc: func(s *api.Service) {
 				s.Spec.Ports[0].Name = "p"
-				s.Spec.Ports = append(s.Spec.Ports, api.ServicePort{Name: "p", Port: 12345})
+				s.Spec.Ports = append(s.Spec.Ports, api.ServicePort{Name: "p", Port: 12345, Protocol: "TCP"})
 			},
 			numErrs: 1,
 		},
@@ -1698,7 +1698,7 @@ func TestValidateService(t *testing.T) {
 			name: "invalid load balancer protocol 2",
 			tweakSvc: func(s *api.Service) {
 				s.Spec.CreateExternalLoadBalancer = true
-				s.Spec.Ports = append(s.Spec.Ports, api.ServicePort{Name: "p", Port: 12345, Protocol: "UDP"})
+				s.Spec.Ports = append(s.Spec.Ports, api.ServicePort{Name: "q", Port: 12345, Protocol: "UDP"})
 			},
 			numErrs: 1,
 		},
@@ -1750,7 +1750,7 @@ func TestValidateService(t *testing.T) {
 			name: "valid external load balancer 2 ports",
 			tweakSvc: func(s *api.Service) {
 				s.Spec.CreateExternalLoadBalancer = true
-				s.Spec.Ports = append(s.Spec.Ports, api.ServicePort{Name: "p", Port: 12345, Protocol: "TCP"})
+				s.Spec.Ports = append(s.Spec.Ports, api.ServicePort{Name: "q", Port: 12345, Protocol: "TCP"})
 			},
 			numErrs: 0,
 		},