}
if (ds->ds_num != xpath->values_len) {
- WARNING("curl_xml plugin: DataSet `%s' requires %zu values, but config "
- "talks about %zu",
+ WARNING("curl_xml plugin: DataSet `%s' requires %" PRIsz
+ " values, but config talks about %" PRIsz,
xpath->type, ds->ds_num, xpath->values_len);
return -1;
}