diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index 307b90b..34dbec0 100644
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -1157,7 +1157,7 @@
  * operation inside the library.
  *
  */
-#define MBEDTLS_SSL_ASYNC_PRIVATE
+//#define MBEDTLS_SSL_ASYNC_PRIVATE
 
 /**
  * \def MBEDTLS_SSL_DEBUG_ALL