diff --git a/include/mbedtls/config.h b/include/mbedtls/config.h
index d0d6bd9d7..d5502a947 100644
--- a/include/mbedtls/config.h
+++ b/include/mbedtls/config.h
@@ -1833,13 +1833,6 @@
  */
 #define MBEDTLS_SSL_TRUNCATED_HMAC
 
-/**
- * \def MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH
- *
- * Enable modifying the maximum I/O buffer size.
- */
-//#define MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH
-
 /**
  * \def MBEDTLS_SSL_TRUNCATED_HMAC_COMPAT
  *
@@ -1864,6 +1857,13 @@
  */
 //#define MBEDTLS_SSL_TRUNCATED_HMAC_COMPAT
 
+/**
+ * \def MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH
+ *
+ * Enable modifying the maximum I/O buffer size.
+ */
+//#define MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH
+
 /**
  * \def MBEDTLS_THREADING_ALT
  *