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-rw-r--r--src/backtrace.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/backtrace.c b/src/backtrace.c
index b60c375f3..2a180f928 100644
--- a/src/backtrace.c
+++ b/src/backtrace.c
@@ -79,7 +79,7 @@ get_backtrace_i(mrb_state *mrb, struct backtrace_location *loc, void *data)
ary = mrb_obj_value((struct RArray*)data);
str = mrb_str_new_cstr(mrb, loc->filename);
- str = mrb_format(mrb, "%S:%S", str, mrb_fixnum_value(loc->lineno));
+ str = mrb_format(mrb, "%S:%S", str, mrb_fixnum_to_str(mrb, mrb_fixnum_value(loc->lineno), 10));
if (loc->method) {
mrb_str_cat_lit(mrb, str, ":in ");