diff --git a/parse.y b/parse.y
index 57235b6009..7c518872c7 100644
--- a/parse.y
+++ b/parse.y
@@ -2908,16 +2908,12 @@ block_param	: f_arg ',' f_block_optarg ',' f_rest_arg opt_block_args_tail
 		    }
 		| f_arg ','
 		    {
-#ifndef RIPPER
+		    /*%%%*/
 			/* magic number for rest_id in iseq_set_arguments() */
 			const ID excessed_comma = 1;
-#else
-			const VALUE excessed_comma =
-			    /*% ripper: excessed_comma! %*/
-			    ;
-#endif
-			$$ = new_args_tail(p, Qnone, Qnone, Qnone, &@1);
-			$$ = new_args(p, $1, Qnone, excessed_comma, Qnone, $$, &@$);
+			$$ = new_args(p, $1, Qnone, excessed_comma, Qnone, new_args_tail(p, Qnone, Qnone, Qnone, &@1), &@$);
+		    /*% %*/
+		    /*% ripper: new_args(p, $1, Qnone, excessed_comma!, Qnone, new_args_tail(p, Qnone, Qnone, Qnone, NULL), NULL) %*/
 		    }
 		| f_arg ',' f_rest_arg ',' f_arg opt_block_args_tail
 		    {