diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index b10d873..ffeeb34 100644
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -163,6 +163,7 @@
 //#define MBEDTLS_PLATFORM_PRINTF_ALT
 //#define MBEDTLS_PLATFORM_SNPRINTF_ALT
 //#define MBEDTLS_PLATFORM_NV_SEED_ALT
+//#define MBEDTLS_PLATFORM_SETUP_ALT
 
 /**
  * \def MBEDTLS_DEPRECATED_WARNING