diff --git a/include/openssl/ssl.h b/include/openssl/ssl.h
index 960bc14..33d2710 100644
--- a/include/openssl/ssl.h
+++ b/include/openssl/ssl.h
@@ -4129,9 +4129,12 @@
     uint8_t peer_finish_md[EVP_MAX_MD_SIZE];
     int peer_finish_md_len;
 
-    unsigned long message_size;
     int message_type;
 
+    /* message_complete is one if the current message is complete and zero
+     * otherwise. */
+    unsigned message_complete:1;
+
     /* used to hold the new cipher we are going to use */
     const SSL_CIPHER *new_cipher;