diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index 80a4fef32..6b7ecf2ca 100644
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -2342,7 +2342,7 @@
  * operation inside the library.
  *
  */
-#define MBEDTLS_SSL_ASYNC_PRIVATE_C
+//#define MBEDTLS_SSL_ASYNC_PRIVATE_C
 
 /**
  * \def MBEDTLS_SSL_CACHE_C