diff --git a/include/mbedtls/ssl.h b/include/mbedtls/ssl.h
index ca130a3..4b59e78 100644
--- a/include/mbedtls/ssl.h
+++ b/include/mbedtls/ssl.h
@@ -2364,7 +2364,7 @@
  */
 int mbedtls_ssl_get_own_cid(mbedtls_ssl_context *ssl,
                             int *enabled,
-                            unsigned char own_cid[MBEDTLS_SSL_CID_OUT_LEN_MAX],
+                            unsigned char own_cid[MBEDTLS_SSL_CID_IN_LEN_MAX],
                             size_t *own_cid_len);
 
 /**