* --jhi Sep 1999 */
if (SvTYPE(sv) < SVt_PVNV)
sv_upgrade(sv, SVt_PVNV);
- SvGROW(sv, NV_DIG + 10); /* sign, decimal separator, e+NNNNN, nul */
+ /* The +20 is pure guesswork. Configure test needed. --jhi */
+ SvGROW(sv, NV_DIG + 20);
s = SvPVX(sv);
olderrno = errno; /* some Xenix systems wipe out errno here */
#ifdef apollo