diff --git a/programs/test/query_config.c b/programs/test/query_config.c
index 71693c7..df532fd 100644
--- a/programs/test/query_config.c
+++ b/programs/test/query_config.c
@@ -1474,6 +1474,14 @@
     }
 #endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
 
+#if defined(MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH)
+    if( strcmp( "MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH", config ) == 0 )
+    {
+        MACRO_EXPANSION_TO_STR( MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH );
+        return( 0 );
+    }
+#endif /* MBEDTLS_SSL_VARIABLE_BUFFER_LENGTH */
+
 #if defined(MBEDTLS_SSL_TRUNCATED_HMAC_COMPAT)
     if( strcmp( "MBEDTLS_SSL_TRUNCATED_HMAC_COMPAT", config ) == 0 )
     {