diff --git a/libwvdrmengine/cdm/core/src/crypto_session.cpp b/libwvdrmengine/cdm/core/src/crypto_session.cpp
index 86289c47..70ea5bed 100644
--- a/libwvdrmengine/cdm/core/src/crypto_session.cpp
+++ b/libwvdrmengine/cdm/core/src/crypto_session.cpp
@@ -678,7 +678,7 @@ CdmResponseType CryptoSession::Decrypt(const CdmDecryptionParameters& params) {
                                params.encrypt_buffer, params.encrypt_length,
                                &buffer_descriptor, params.subsample_flags);
   }
-  if (params.cipher_mode != cipher_mode_) {
+  if (params.is_encrypted && params.cipher_mode != cipher_mode_) {
     return INCORRECT_CRYPTO_MODE;
   }
   if (params.is_encrypted || sts == OEMCrypto_ERROR_NOT_IMPLEMENTED) {