--- a/ucx/buffer.c	Wed Nov 22 12:59:13 2017 +0100
+++ b/ucx/buffer.c	Sun Jan 21 12:13:09 2018 +0100
@@ -1,7 +1,7 @@
 /*
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
  *
- * Copyright 2015 Olaf Wintermann. All rights reserved.
+ * Copyright 2016 Olaf Wintermann. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
@@ -150,6 +150,7 @@
 size_t ucx_buffer_write(const void *ptr, size_t size, size_t nitems,
         UcxBuffer *buffer) {
     size_t len = size * nitems;
+    const char *string = ptr;
     size_t required = buffer->pos + len;
     if (buffer->pos > required) {
         return 0;