diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index 0f7e29b..2ef052b 100644
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -237,6 +237,7 @@
 //#define MBEDTLS_ARC4_ALT
 //#define MBEDTLS_BLOWFISH_ALT
 //#define MBEDTLS_CAMELLIA_ALT
+//#define MBEDTLS_CMAC_ALT
 //#define MBEDTLS_DES_ALT
 //#define MBEDTLS_XTEA_ALT
 //#define MBEDTLS_MD2_ALT