diff --git a/staging/src/k8s.io/code-generator/cmd/client-gen/generators/fake/generator_fake_for_clientset.go b/staging/src/k8s.io/code-generator/cmd/client-gen/generators/fake/generator_fake_for_clientset.go
index c0e6769b5d3..c5df71d666e 100644
--- a/staging/src/k8s.io/code-generator/cmd/client-gen/generators/fake/generator_fake_for_clientset.go
+++ b/staging/src/k8s.io/code-generator/cmd/client-gen/generators/fake/generator_fake_for_clientset.go
@@ -210,6 +210,17 @@ func (c *Clientset) Discovery() discovery.DiscoveryInterface {
 func (c *Clientset) Tracker() testing.ObjectTracker {
 	return c.tracker
 }
+
+// IsWatchListSemanticsSupported informs the reflector that this client
+// doesn't support WatchList semantics.
+//
+// This is a synthetic method whose sole purpose is to satisfy the optional
+// interface check performed by the reflector.
+// Returning true signals that WatchList can NOT be used.
+// No additional logic is implemented here.
+func (c *Clientset) IsWatchListSemanticsUnSupported() bool {
+	return true
+}
 `
 
 var checkImpl = `