diff --git a/libwvdrmengine/cdm/core/src/crypto_session.cpp b/libwvdrmengine/cdm/core/src/crypto_session.cpp
index 4b77072a..3621a589 100644
--- a/libwvdrmengine/cdm/core/src/crypto_session.cpp
+++ b/libwvdrmengine/cdm/core/src/crypto_session.cpp
@@ -1489,7 +1489,7 @@ CdmResponseType CryptoSession::GenerateNonce(uint32_t* nonce) {
   }
 
   OEMCryptoResult result;
-  WithOecSessionLock("GenerateNonce", [&] {
+  WithOecWriteLock("GenerateNonce", [&] {
     result = OEMCrypto_GenerateNonce(oec_session_id_, nonce);
   });
   metrics_->oemcrypto_generate_nonce_.Increment(result);