1 files changed, 1 insertions, 0 deletions
diff --git a/error.c b/error.c
index feb3778d54..ec66ba1b9a 100644
--- a/error.c
+++ b/error.c
@@ -386,6 +386,7 @@ check_backtrace(bt)
 static VALUE
 exc_set_backtrace(exc, bt)
     VALUE exc;
+    VALUE bt;
 {
     return rb_iv_set(exc, "bt", check_backtrace(bt));
 }