https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93592
--- Comment #2 from Dominique d'Humieres <dominiq at lps dot ens.fr> --- --- ../_clean/libgfortran/io/write_float.def 2020-06-13 03:11:55.000000000 +0200 +++ libgfortran/io/write_float.def 2020-07-19 22:46:57.000000000 +0200 @@ -399,7 +399,7 @@ build_float_string (st_parameter_dt *dtp updown: rchar = '0'; - if (ft != FMT_F && w > 0 && d == 0 && p == 0) + if (ft != FMT_F && ft !=FMT_EN && w > 0 && d == 0 && p == 0) nbefore = 1; /* Scan for trailing zeros to see if we really need to round it. */ for(i = nbefore + nafter; i < ndigits; i++) should do the trick. I am currently try to reuse gfortran.dg/fmt_en.f90 for a more general testing.