diff --git a/libwvdrmengine/cdm/core/src/license_protocol.proto b/libwvdrmengine/cdm/core/src/license_protocol.proto
index 8fc334bb..cc23e7cf 100644
--- a/libwvdrmengine/cdm/core/src/license_protocol.proto
+++ b/libwvdrmengine/cdm/core/src/license_protocol.proto
@@ -348,6 +348,9 @@ message ProvisioningRequest {
   optional bytes nonce = 2;
   // Options for type of certificate to generate.  Optional.
   optional ProvisioningOptions options = 3;
+  // Stable identifier, unique for each device + application (or origin).
+  // Required if doing per-origin provisioning.
+  optional bytes stable_id = 4;
 }
 
 // Provisioning response sent by the provisioning server to client devices.