1 files changed, 4 insertions, 2 deletions
diff --git a/parse.y b/parse.y
index a6495610bd..f0b019670a 100644
--- a/parse.y
+++ b/parse.y
@@ -4939,8 +4939,10 @@ VALUE ruby_suppress_tracing(VALUE (*func)(VALUE, int), VALUE arg, int always);
 static VALUE
 debug_lines(const char *f)
 {
-    if (rb_const_defined_at(rb_cObject, rb_intern("SCRIPT_LINES__"))) {
-	VALUE hash = rb_const_get_at(rb_cObject, rb_intern("SCRIPT_LINES__"));
+    ID script_lines;
+    CONST_ID(script_lines, "SCRIPT_LINES__");
+    if (rb_const_defined_at(rb_cObject, script_lines)) {
+	VALUE hash = rb_const_get_at(rb_cObject, script_lines);
 	if (TYPE(hash) == T_HASH) {
 	    VALUE fname = rb_str_new2(f);
 	    VALUE lines = rb_ary_new();