1 files changed, 1 insertions, 0 deletions
diff --git a/eval.c b/eval.c
index 1948ac9d98..7f58a9765f 100644
--- a/eval.c
+++ b/eval.c
@@ -380,6 +380,7 @@ setup_exception(rb_thread_t *th, int tag, volatile VALUE mesg)
     if (file && !NIL_P(mesg)) {
 	if (mesg == sysstack_error) {
 	    at = rb_enc_sprintf(rb_usascii_encoding(), "%s:%d", file, line);
+	    at = rb_ary_new3(1, at);
 	    rb_iv_set(mesg, "bt", at);
 	}
 	else {