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-rw-r--r--src/error.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/error.c b/src/error.c
index 0ef7bc9c1..206d1a0e8 100644
--- a/src/error.c
+++ b/src/error.c
@@ -27,7 +27,7 @@ mrb_exc_new(mrb_state *mrb, struct RClass *c, const char *ptr, size_t len)
MRB_API mrb_value
mrb_exc_new_str(mrb_state *mrb, struct RClass* c, mrb_value str)
{
- mrb_to_str(mrb, str);
+ mrb_ensure_string_type(mrb, str);
return mrb_obj_new(mrb, c, 1, &str);
}