diff --git a/src/_cffi_src/openssl/ssl.py b/src/_cffi_src/openssl/ssl.py
index 73221219b83e..7e7b2b8bd91b 100644
--- a/src/_cffi_src/openssl/ssl.py
+++ b/src/_cffi_src/openssl/ssl.py
@@ -108,6 +108,7 @@
 static const long SSL_CB_HANDSHAKE_DONE;
 static const long SSL_MODE_RELEASE_BUFFERS;
 static const long SSL_MODE_ENABLE_PARTIAL_WRITE;
+static const long SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER;
 static const long SSL_MODE_AUTO_RETRY;
 static const long TLS_ST_BEFORE;
 static const long TLS_ST_OK;