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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 9989abf2f..d2ea4c321 100644
--- a/mrbgems/mruby-sprintf/src/sprintf.c
+++ b/mrbgems/mruby-sprintf/src/sprintf.c
@@ -528,7 +528,7 @@ mrb_str_format(mrb_state *mrb, int argc, const mrb_value *argv, mrb_value fmt)
++argc;
--argv;
- mrb_string_value(mrb, &fmt);
+ fmt = mrb_str_to_str(mrb, fmt);
p = RSTRING_PTR(fmt);
end = p + RSTRING_LEN(fmt);
blen = 0;