diff --git a/pkg/apis/rbac/v1alpha1/types.go b/pkg/apis/rbac/v1alpha1/types.go
index 0863dfbf588..3ecc55fd0b1 100644
--- a/pkg/apis/rbac/v1alpha1/types.go
+++ b/pkg/apis/rbac/v1alpha1/types.go
@@ -87,7 +87,7 @@ type RoleBinding struct {
 	v1.ObjectMeta `json:"metadata,omitempty" protobuf:"bytes,1,opt,name=metadata"`
 
 	// Subjects holds references to the objects the role applies to.
-	Subjects []Subject `json:"subject" protobuf:"bytes,2,rep,name=subjects"`
+	Subjects []Subject `json:"subjects" protobuf:"bytes,2,rep,name=subjects"`
 
 	// RoleRef can reference a Role in the current namespace or a ClusterRole in the global namespace.
 	// If the RoleRef cannot be resolved, the Authorizer must return an error.
@@ -136,7 +136,7 @@ type ClusterRoleBinding struct {
 	v1.ObjectMeta `json:"metadata,omitempty" protobuf:"bytes,1,opt,name=metadata"`
 
 	// Subjects holds references to the objects the role applies to.
-	Subjects []Subject `json:"subject" protobuf:"bytes,2,rep,name=subjects"`
+	Subjects []Subject `json:"subjects" protobuf:"bytes,2,rep,name=subjects"`
 
 	// RoleRef can only reference a ClusterRole in the global namespace.
 	// If the RoleRef cannot be resolved, the Authorizer must return an error.