--- sv.c.bak 2014-03-24 15:11:48.007595042 +0100 +++ sv.c 2014-03-25 11:57:41.154752451 +0100 @@ -2175,7 +2175,7 @@ S_sv_2iuv_common(pTHX_ SV *const sv) #ifndef NV_PRESERVES_UV && SvIVX(sv) != IV_MIN /* avoid negating IV_MIN below */ && (((UV)1 << NV_PRESERVES_UV_BITS) > - (UV)(SvIVX(sv) > 0 ? SvIVX(sv) : -SvIVX(sv))) + (UV)(SvIVX(sv) > 0 ? (UV)SvIVX(sv) : -(UV)SvIVX(sv))) /* Don't flag it as "accurately an integer" if the number came from a (by definition imprecise) NV operation, and we're outside the range of NV integer precision */