#ifdef USE_THREADS
dTHR;
SV **svp = &THREADSV(i); /* XXX Change to save by offset */
- DEBUG_S(PerlIO_printf(Perl_debug_log, "save_threadsv %u: %p %p:%s\n",
- i, svp, *svp, SvPEEK(*svp)));
+ DEBUG_S(PerlIO_printf(Perl_debug_log, "save_threadsv %"UVuf": %p %p:%s\n",
+ (UV)i, svp, *svp, SvPEEK(*svp)));
save_svref(svp);
return svp;
#else