#if HAVE_SENDFILE
ssize_t sent_size = sendfile(fdout, fdin, NULL, fdin_size);
xbt_assert(sent_size == fdin_size,
- "Error while copying %s: only %zd bytes copied instead of %zd (errno: %d -- %s)",
+ "Error while copying %s: only %zd bytes copied instead of %ld (errno: %d -- %s)",
target_executable.c_str(), sent_size, fdin_size, errno, strerror(errno));
#else
XBT_WARN("Copy %d bytes into %s", static_cast<int>(fdin_size), target_executable.c_str());