diff --git a/vmm/src/api/openapi/cloud-hypervisor.yaml b/vmm/src/api/openapi/cloud-hypervisor.yaml
index aa9f0d882..93473cbcc 100644
--- a/vmm/src/api/openapi/cloud-hypervisor.yaml
+++ b/vmm/src/api/openapi/cloud-hypervisor.yaml
@@ -395,6 +395,7 @@ components:
       properties:
         cid:
           type: integer
+          format: int64
           minimum: 3
           description: Guest Vsock CID
         sock: