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-rw-r--r--include/mruby/numeric.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/mruby/numeric.h b/include/mruby/numeric.h
index 52e335ade..e09a797ed 100644
--- a/include/mruby/numeric.h
+++ b/include/mruby/numeric.h
@@ -166,7 +166,7 @@ MRB_API mrb_float mrb_as_float(mrb_state *mrb, mrb_value x);
/* internal functions */
mrb_float mrb_div_float(mrb_float x, mrb_float y);
-mrb_value mrb_float_to_str(mrb_state *mrb, mrb_value x);
+mrb_value mrb_float_to_str(mrb_state *mrb, mrb_value x, const char *fmt);
int mrb_format_float(mrb_float f, char *buf, size_t buf_size, char fmt, int prec, char sign);
/* obsolete functions; will be removed */