diff --git a/staging/src/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/install/roundtrip_test.go b/staging/src/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/install/roundtrip_test.go
index f199dd5e543..9f76d1f3950 100644
--- a/staging/src/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/install/roundtrip_test.go
+++ b/staging/src/k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/install/roundtrip_test.go
@@ -25,4 +25,5 @@ import (
 
 func TestRoundTrip(t *testing.T) {
 	roundtrip.RoundTripTestForAPIGroup(t, Install, apiextensionsfuzzer.Funcs)
+	roundtrip.RoundTripProtobufTestForAPIGroup(t, Install, apiextensionsfuzzer.Funcs)
 }
diff --git a/staging/src/k8s.io/apimachinery/pkg/apis/testapigroup/install/roundtrip_test.go b/staging/src/k8s.io/apimachinery/pkg/apis/testapigroup/install/roundtrip_test.go
index 7ad4986b545..7e9b427a87d 100644
--- a/staging/src/k8s.io/apimachinery/pkg/apis/testapigroup/install/roundtrip_test.go
+++ b/staging/src/k8s.io/apimachinery/pkg/apis/testapigroup/install/roundtrip_test.go
@@ -25,4 +25,5 @@ import (
 
 func TestRoundTrip(t *testing.T) {
 	roundtrip.RoundTripTestForAPIGroup(t, Install, testapigroupfuzzer.Funcs)
+	roundtrip.RoundTripProtobufTestForAPIGroup(t, Install, testapigroupfuzzer.Funcs)
 }
diff --git a/staging/src/k8s.io/apiserver/pkg/apis/audit/install/roundtrip_test.go b/staging/src/k8s.io/apiserver/pkg/apis/audit/install/roundtrip_test.go
index 9497a364594..15146a22082 100644
--- a/staging/src/k8s.io/apiserver/pkg/apis/audit/install/roundtrip_test.go
+++ b/staging/src/k8s.io/apiserver/pkg/apis/audit/install/roundtrip_test.go
@@ -25,4 +25,5 @@ import (
 
 func TestRoundTrip(t *testing.T) {
 	roundtrip.RoundTripTestForAPIGroup(t, Install, fuzzer.Funcs)
+	roundtrip.RoundTripProtobufTestForAPIGroup(t, Install, fuzzer.Funcs)
 }
diff --git a/staging/src/k8s.io/apiserver/pkg/apis/example/install/roundtrip_test.go b/staging/src/k8s.io/apiserver/pkg/apis/example/install/roundtrip_test.go
index 7f67418d245..6cb530b1b86 100644
--- a/staging/src/k8s.io/apiserver/pkg/apis/example/install/roundtrip_test.go
+++ b/staging/src/k8s.io/apiserver/pkg/apis/example/install/roundtrip_test.go
@@ -25,4 +25,5 @@ import (
 
 func TestRoundTrip(t *testing.T) {
 	roundtrip.RoundTripTestForAPIGroup(t, Install, examplefuzzer.Funcs)
+	roundtrip.RoundTripProtobufTestForAPIGroup(t, Install, examplefuzzer.Funcs)
 }
diff --git a/staging/src/k8s.io/apiserver/pkg/apis/example2/install/roundtrip_test.go b/staging/src/k8s.io/apiserver/pkg/apis/example2/install/roundtrip_test.go
index 7f67418d245..6cb530b1b86 100644
--- a/staging/src/k8s.io/apiserver/pkg/apis/example2/install/roundtrip_test.go
+++ b/staging/src/k8s.io/apiserver/pkg/apis/example2/install/roundtrip_test.go
@@ -25,4 +25,5 @@ import (
 
 func TestRoundTrip(t *testing.T) {
 	roundtrip.RoundTripTestForAPIGroup(t, Install, examplefuzzer.Funcs)
+	roundtrip.RoundTripProtobufTestForAPIGroup(t, Install, examplefuzzer.Funcs)
 }
diff --git a/staging/src/k8s.io/sample-apiserver/pkg/apis/wardle/install/roundtrip_test.go b/staging/src/k8s.io/sample-apiserver/pkg/apis/wardle/install/roundtrip_test.go
index 89cd8c02e47..35d97143284 100644
--- a/staging/src/k8s.io/sample-apiserver/pkg/apis/wardle/install/roundtrip_test.go
+++ b/staging/src/k8s.io/sample-apiserver/pkg/apis/wardle/install/roundtrip_test.go
@@ -25,4 +25,6 @@ import (
 
 func TestRoundTripTypes(t *testing.T) {
 	roundtrip.RoundTripTestForAPIGroup(t, Install, wardlefuzzer.Funcs)
+	// TODO: enable protobuf generation for the sample-apiserver
+	// roundtrip.RoundTripProtobufTestForAPIGroup(t, Install, wardlefuzzer.Funcs)
 }