diff --git a/api/v1alpha1/tunnelbinding_types.go b/api/v1alpha1/tunnelbinding_types.go
index f01f827..9330146 100644
--- a/api/v1alpha1/tunnelbinding_types.go
+++ b/api/v1alpha1/tunnelbinding_types.go
@@ -139,7 +139,7 @@ type TunnelBinding struct {
 	metav1.TypeMeta   `json:",inline"`
 	metav1.ObjectMeta `json:"metadata,omitempty"`
 
-	Spec   TunnelBindingSpec   `json:"spec,omitempty"`
+	Spec   TunnelBindingSpec   `json:"spec"`
 	Status TunnelBindingStatus `json:"status,omitempty"`
 }
 
diff --git a/config/crd/bases/networking.cfargotunnel.com_tunnelbindings.yaml b/config/crd/bases/networking.cfargotunnel.com_tunnelbindings.yaml
index b61f517..2ad1915 100644
--- a/config/crd/bases/networking.cfargotunnel.com_tunnelbindings.yaml
+++ b/config/crd/bases/networking.cfargotunnel.com_tunnelbindings.yaml
@@ -174,6 +174,8 @@ spec:
             - hostnames
             - services
             type: object
+        required:
+        - spec
         type: object
     served: true
     storage: true