uschar errbuf[128];
pcre2_get_error_message(err, errbuf, sizeof(errbuf));
expand_string_message = string_sprintf("regular expression error in "
- "\"%s\": %s at offset %d", sub[1], errbuf, offset);
+ "\"%s\": %s at offset %ld", sub[1], errbuf, (long)offset);
return NULL;
}