diff --git a/internal/apis/acme/v1alpha2/register.go b/internal/apis/acme/v1alpha2/register.go
index 92ba28607..198b1daaf 100644
--- a/internal/apis/acme/v1alpha2/register.go
+++ b/internal/apis/acme/v1alpha2/register.go
@@ -17,6 +17,7 @@ limitations under the License.
 package v1alpha2
 
 import (
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/runtime/schema"
 
@@ -42,4 +43,21 @@ func init() {
 	// generated functions takes place in the generated files. The separation
 	// makes the code compile even when the generated files are missing.
 	localSchemeBuilder.Register(addDefaultingFuncs)
+
+	// We only register manually written functions here. The registration of the
+	// generated functions takes place in the generated files. The separation
+	// makes the code compile even when the generated files are missing.
+	localSchemeBuilder.Register(addKnownTypes)
+}
+
+// Adds the list of known types to api.Scheme.
+func addKnownTypes(scheme *runtime.Scheme) error {
+	scheme.AddKnownTypes(SchemeGroupVersion,
+		&Order{},
+		&OrderList{},
+		&Challenge{},
+		&ChallengeList{},
+	)
+	metav1.AddToGroupVersion(scheme, SchemeGroupVersion)
+	return nil
 }
diff --git a/internal/apis/acme/v1alpha3/register.go b/internal/apis/acme/v1alpha3/register.go
index d066fca64..2c0205b10 100644
--- a/internal/apis/acme/v1alpha3/register.go
+++ b/internal/apis/acme/v1alpha3/register.go
@@ -17,6 +17,7 @@ limitations under the License.
 package v1alpha3
 
 import (
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/runtime/schema"
 
@@ -42,4 +43,21 @@ func init() {
 	// generated functions takes place in the generated files. The separation
 	// makes the code compile even when the generated files are missing.
 	localSchemeBuilder.Register(addDefaultingFuncs)
+
+	// We only register manually written functions here. The registration of the
+	// generated functions takes place in the generated files. The separation
+	// makes the code compile even when the generated files are missing.
+	localSchemeBuilder.Register(addKnownTypes)
+}
+
+// Adds the list of known types to api.Scheme.
+func addKnownTypes(scheme *runtime.Scheme) error {
+	scheme.AddKnownTypes(SchemeGroupVersion,
+		&Order{},
+		&OrderList{},
+		&Challenge{},
+		&ChallengeList{},
+	)
+	metav1.AddToGroupVersion(scheme, SchemeGroupVersion)
+	return nil
 }
diff --git a/internal/apis/acme/v1beta1/register.go b/internal/apis/acme/v1beta1/register.go
index a6d7c3d51..48de06bda 100644
--- a/internal/apis/acme/v1beta1/register.go
+++ b/internal/apis/acme/v1beta1/register.go
@@ -17,6 +17,7 @@ limitations under the License.
 package v1beta1
 
 import (
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/runtime/schema"
 
@@ -42,4 +43,21 @@ func init() {
 	// generated functions takes place in the generated files. The separation
 	// makes the code compile even when the generated files are missing.
 	localSchemeBuilder.Register(addDefaultingFuncs)
+
+	// We only register manually written functions here. The registration of the
+	// generated functions takes place in the generated files. The separation
+	// makes the code compile even when the generated files are missing.
+	localSchemeBuilder.Register(addKnownTypes)
+}
+
+// Adds the list of known types to api.Scheme.
+func addKnownTypes(scheme *runtime.Scheme) error {
+	scheme.AddKnownTypes(SchemeGroupVersion,
+		&Order{},
+		&OrderList{},
+		&Challenge{},
+		&ChallengeList{},
+	)
+	metav1.AddToGroupVersion(scheme, SchemeGroupVersion)
+	return nil
 }
diff --git a/internal/apis/certmanager/v1alpha2/register.go b/internal/apis/certmanager/v1alpha2/register.go
index d3b6f2f43..f7652c690 100644
--- a/internal/apis/certmanager/v1alpha2/register.go
+++ b/internal/apis/certmanager/v1alpha2/register.go
@@ -17,6 +17,7 @@ limitations under the License.
 package v1alpha2
 
 import (
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/runtime/schema"
 
@@ -42,4 +43,25 @@ func init() {
 	// generated functions takes place in the generated files. The separation
 	// makes the code compile even when the generated files are missing.
 	localSchemeBuilder.Register(addDefaultingFuncs)
+
+	// We only register manually written functions here. The registration of the
+	// generated functions takes place in the generated files. The separation
+	// makes the code compile even when the generated files are missing.
+	localSchemeBuilder.Register(addKnownTypes)
+}
+
+// Adds the list of known types to api.Scheme.
+func addKnownTypes(scheme *runtime.Scheme) error {
+	scheme.AddKnownTypes(SchemeGroupVersion,
+		&Certificate{},
+		&CertificateList{},
+		&Issuer{},
+		&IssuerList{},
+		&ClusterIssuer{},
+		&ClusterIssuerList{},
+		&CertificateRequest{},
+		&CertificateRequestList{},
+	)
+	metav1.AddToGroupVersion(scheme, SchemeGroupVersion)
+	return nil
 }
diff --git a/internal/apis/certmanager/v1alpha3/register.go b/internal/apis/certmanager/v1alpha3/register.go
index 292f00dbf..0cadbef88 100644
--- a/internal/apis/certmanager/v1alpha3/register.go
+++ b/internal/apis/certmanager/v1alpha3/register.go
@@ -17,6 +17,7 @@ limitations under the License.
 package v1alpha3
 
 import (
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/runtime/schema"
 
@@ -42,4 +43,25 @@ func init() {
 	// generated functions takes place in the generated files. The separation
 	// makes the code compile even when the generated files are missing.
 	localSchemeBuilder.Register(addDefaultingFuncs)
+
+	// We only register manually written functions here. The registration of the
+	// generated functions takes place in the generated files. The separation
+	// makes the code compile even when the generated files are missing.
+	localSchemeBuilder.Register(addKnownTypes)
+}
+
+// Adds the list of known types to api.Scheme.
+func addKnownTypes(scheme *runtime.Scheme) error {
+	scheme.AddKnownTypes(SchemeGroupVersion,
+		&Certificate{},
+		&CertificateList{},
+		&Issuer{},
+		&IssuerList{},
+		&ClusterIssuer{},
+		&ClusterIssuerList{},
+		&CertificateRequest{},
+		&CertificateRequestList{},
+	)
+	metav1.AddToGroupVersion(scheme, SchemeGroupVersion)
+	return nil
 }
diff --git a/internal/apis/certmanager/v1beta1/register.go b/internal/apis/certmanager/v1beta1/register.go
index 55a62138e..2001ba278 100644
--- a/internal/apis/certmanager/v1beta1/register.go
+++ b/internal/apis/certmanager/v1beta1/register.go
@@ -17,6 +17,7 @@ limitations under the License.
 package v1beta1
 
 import (
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 	"k8s.io/apimachinery/pkg/runtime"
 	"k8s.io/apimachinery/pkg/runtime/schema"
 
@@ -42,4 +43,25 @@ func init() {
 	// generated functions takes place in the generated files. The separation
 	// makes the code compile even when the generated files are missing.
 	localSchemeBuilder.Register(addDefaultingFuncs)
+
+	// We only register manually written functions here. The registration of the
+	// generated functions takes place in the generated files. The separation
+	// makes the code compile even when the generated files are missing.
+	localSchemeBuilder.Register(addKnownTypes)
+}
+
+// Adds the list of known types to api.Scheme.
+func addKnownTypes(scheme *runtime.Scheme) error {
+	scheme.AddKnownTypes(SchemeGroupVersion,
+		&Certificate{},
+		&CertificateList{},
+		&Issuer{},
+		&IssuerList{},
+		&ClusterIssuer{},
+		&ClusterIssuerList{},
+		&CertificateRequest{},
+		&CertificateRequestList{},
+	)
+	metav1.AddToGroupVersion(scheme, SchemeGroupVersion)
+	return nil
 }