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-rw-r--r--strftime.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/strftime.c b/strftime.c
index 42761f0d7c..81e56d1f7b 100644
--- a/strftime.c
+++ b/strftime.c
@@ -326,6 +326,7 @@ rb_strftime_with_timespec(VALUE ftime, const char *format, size_t format_len,
const char *fmts = FMT_PADDING(fmt, def_pad); \
precision = FMT_PRECISION(def_prec); \
tmp = format_value(fmts, tmp, precision); \
+ rb_str_set_len(ftime, s-start); \
rb_str_append(ftime, tmp); \
RSTRING_GETMEM(ftime, s, len); \
endp = (start = s) + rb_str_capacity(ftime); \