--- a/sdk/src/crypto/OSSEncryptionClient.cpp
+++ b/sdk/src/crypto/OSSEncryptionClient.cpp
@@ -18,8 +18,6 @@
 constexpr const char* kCseCekAlgHeader = "x-oss-meta-client-side-encryption-cek-alg";
 constexpr const char* kCseWrapAlgHeader = "x-oss-meta-client-side-encryption-wrap-alg";
 constexpr const char* kCseMatDescHeader = "x-oss-meta-client-side-encryption-matdesc";
-constexpr const char* kCseDataSizeHeader = "x-oss-meta-client-side-encryption-data-size";
-constexpr const char* kCsePartSizeHeader = "x-oss-meta-client-side-encryption-part-size";
 constexpr const char* kCseUnencryptedContentLengthHeader =
     "x-oss-meta-client-side-encryption-unencrypted-content-length";
 constexpr const char* kCseUnencryptedContentMD5Header = "x-oss-meta-client-side-encryption-unencrypted-content-md5";