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-rw-r--r--mrbgems/mruby-sprintf/src/sprintf.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mrbgems/mruby-sprintf/src/sprintf.c b/mrbgems/mruby-sprintf/src/sprintf.c
index 6a7c0bd7c..d20699247 100644
--- a/mrbgems/mruby-sprintf/src/sprintf.c
+++ b/mrbgems/mruby-sprintf/src/sprintf.c
@@ -556,7 +556,7 @@ mrb_str_format(mrb_state *mrb, int argc, const mrb_value *argv, mrb_value fmt)
end = p + RSTRING_LEN(fmt);
blen = 0;
bsiz = 120;
- result = mrb_str_buf_new(mrb, bsiz);
+ result = mrb_str_new_capa(mrb, bsiz);
buf = RSTRING_PTR(result);
memset(buf, 0, bsiz);