diff --git a/libwvdrmengine/cdm/core/src/cdm_engine.cpp b/libwvdrmengine/cdm/core/src/cdm_engine.cpp
index 7b13434b..fbd1afdd 100644
--- a/libwvdrmengine/cdm/core/src/cdm_engine.cpp
+++ b/libwvdrmengine/cdm/core/src/cdm_engine.cpp
@@ -127,6 +127,9 @@ CdmResponseType CdmEngine::OpenSession(const CdmKeySystem& key_system,
     if (sts == NEED_PROVISIONING) {
       cert_provisioning_requested_security_level_ =
           new_session->GetRequestedSecurityLevel();
+      // Reserve a session ID so the CDM can return success.
+      if (session_id)
+        *session_id = new_session->GenerateSessionId();
     } else {
       LOGE("CdmEngine::OpenSession: bad session init: %d", sts);
     }