On Thu, 15 Nov 2018, Gabriel F. T. Gomes wrote: >- if (s->_flags2 & _IO_FLAGS2_SCANF_STD) >+ if (__glibc_likely ((mode_flags & SCANF_ISOC99_A) == 1)) This should have been: if (__glibc_likely ((mode_flags & SCANF_ISOC99_A) != 0)) Fixed locally. Sorry about that.