diff --git a/libwvdrmengine/oemcrypto/test/oec_session_util.cpp b/libwvdrmengine/oemcrypto/test/oec_session_util.cpp
index 4ffb714e..6d325605 100644
--- a/libwvdrmengine/oemcrypto/test/oec_session_util.cpp
+++ b/libwvdrmengine/oemcrypto/test/oec_session_util.cpp
@@ -567,7 +567,7 @@ void ProvisioningRoundTrip::VerifyLoadFailed() {
 }
 
 void Provisioning40RoundTrip::PrepareSession(bool is_oem_key) {
-  const size_t buffer_size = 5000;  // Make sure it is large enough.
+  const size_t buffer_size = 10240;  // Make sure it is large enough.
   std::vector<uint8_t> public_key(buffer_size);
   size_t public_key_size = buffer_size;
   std::vector<uint8_t> public_key_signature(buffer_size);
@@ -629,7 +629,7 @@ OEMCryptoResult Provisioning40RoundTrip::LoadDRMCertResponse() {
 }
 
 void Provisioning40CastRoundTrip::PrepareSession() {
-  const size_t buffer_size = 5000;  // Make sure it is large enough.
+  const size_t buffer_size = 10240;  // Make sure it is large enough.
   std::vector<uint8_t> public_key(buffer_size);
   size_t public_key_size = buffer_size;
   std::vector<uint8_t> public_key_signature(buffer_size);