diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index 3c3c1ce..0fca50a 100644
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -1616,13 +1616,13 @@
 
 
 /**
- * \def MBEDTLS_IMMEDIATE_TRANSMISSION
+ * \def MBEDTLS_SSL_IMMEDIATE_TRANSMISSION
  *
  * Force stack to immediately transmit messages.
  *
  * Requires: MBEDTLS_SSL_PROTO_DTLS
  */
-//#define MBEDTLS_IMMEDIATE_TRANSMISSION
+//#define MBEDTLS_SSL_IMMEDIATE_TRANSMISSION
 
 /**
  * \def MBEDTLS_EARLY_KEY_COMPUTATION