1 files changed, 1 insertions, 1 deletions
diff --git a/parse.y b/parse.y
index 70c0850b3..8fdd12e17 100644
--- a/parse.y
+++ b/parse.y
@@ -4597,7 +4597,7 @@ debug_lines(VALUE f)
 	VALUE hash = rb_const_get_at(rb_cObject, rb_intern("SCRIPT_LINES__"));
 	if (TYPE(hash) == T_HASH) {
 	    VALUE fname = rb_str_new2((const char *)f);
-	    VALUE lines = rb_hash_aref(hash, fname);
+	    VALUE lines = rb_hash_lookup(hash, fname);
 	    if (NIL_P(lines)) {
 		lines = rb_ary_new();
 		rb_hash_aset(hash, fname, lines);