diff --git a/pkg/client/fake/client.go b/pkg/client/fake/client.go
index 1f0efc82bb..858d69a23e 100644
--- a/pkg/client/fake/client.go
+++ b/pkg/client/fake/client.go
@@ -51,6 +51,7 @@ type versionedTracker struct {
 type fakeClient struct {
 	tracker         versionedTracker
 	scheme          *runtime.Scheme
+	restMapper      meta.RESTMapper
 	schemeWriteLock sync.Mutex
 }
 
@@ -87,6 +88,7 @@ func NewClientBuilder() *ClientBuilder {
 // ClientBuilder builds a fake client.
 type ClientBuilder struct {
 	scheme             *runtime.Scheme
+	restMapper         meta.RESTMapper
 	initObject         []client.Object
 	initLists          []client.ObjectList
 	initRuntimeObjects []runtime.Object
@@ -99,6 +101,14 @@ func (f *ClientBuilder) WithScheme(scheme *runtime.Scheme) *ClientBuilder {
 	return f
 }
 
+// WithRESTMapper sets this builder's restMapper.
+// The restMapper is directly set as mapper in the Client. This can be used for example
+// with a meta.DefaultRESTMapper to provide a static rest mapping.
+func (f *ClientBuilder) WithRESTMapper(restMapper meta.RESTMapper) *ClientBuilder {
+	f.restMapper = restMapper
+	return f
+}
+
 // WithObjects can be optionally used to initialize this fake client with client.Object(s).
 func (f *ClientBuilder) WithObjects(initObjs ...client.Object) *ClientBuilder {
 	f.initObject = append(f.initObject, initObjs...)
@@ -140,8 +150,9 @@ func (f *ClientBuilder) Build() client.WithWatch {
 		}
 	}
 	return &fakeClient{
-		tracker: tracker,
-		scheme:  f.scheme,
+		tracker:    tracker,
+		scheme:     f.scheme,
+		restMapper: f.restMapper,
 	}
 }
 
@@ -417,8 +428,7 @@ func (c *fakeClient) Scheme() *runtime.Scheme {
 }
 
 func (c *fakeClient) RESTMapper() meta.RESTMapper {
-	// TODO: Implement a fake RESTMapper.
-	return nil
+	return c.restMapper
 }
 
 func (c *fakeClient) Create(ctx context.Context, obj client.Object, opts ...client.CreateOption) error {