diff --git a/vmm/src/api/openapi/cloud-hypervisor.yaml b/vmm/src/api/openapi/cloud-hypervisor.yaml
index aa4a3c07c..4a79b1406 100644
--- a/vmm/src/api/openapi/cloud-hypervisor.yaml
+++ b/vmm/src/api/openapi/cloud-hypervisor.yaml
@@ -374,6 +374,7 @@ components:
           type: string
 
     InitramfsConfig:
+      nullable: true
       required:
       - path
       type: object