diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h
index ec4a15c..3ca74a0 100644
--- a/include/mbedtls/ssl.h
+++ b/include/mbedtls/ssl.h
@@ -1106,6 +1106,10 @@
                                      TLS: maintained by us
                                      DTLS: read from peer             */
     unsigned char *in_hdr;      /*!< start of record header           */
+#if defined(MBEDTLS_SSL_CID)
+    unsigned char *in_cid;      /*!< The start of the CID;
+                                 *   (the end is marked by in_len).   */
+#endif /* MBEDTLS_SSL_CID */
     unsigned char *in_len;      /*!< two-bytes message length field   */
     unsigned char *in_iv;       /*!< ivlen-byte IV                    */
     unsigned char *in_msg;      /*!< message contents (in_iv+ivlen)   */
@@ -1142,6 +1146,10 @@
     unsigned char *out_buf;     /*!< output buffer                    */
     unsigned char *out_ctr;     /*!< 64-bit outgoing message counter  */
     unsigned char *out_hdr;     /*!< start of record header           */
+#if defined(MBEDTLS_SSL_CID)
+    unsigned char *out_cid;     /*!< The start of the CID;
+                                 *   (the end is marked by in_len).   */
+#endif /* MBEDTLS_SSL_CID */
     unsigned char *out_len;     /*!< two-bytes message length field   */
     unsigned char *out_iv;      /*!< ivlen-byte IV                    */
     unsigned char *out_msg;     /*!< message contents (out_iv+ivlen)  */