--- a/ucx/buffer.c Sun Sep 17 11:22:16 2017 +0200 +++ b/ucx/buffer.c Sun Sep 17 16:36:45 2017 +0200 @@ -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;