diff --git a/usr.bin/xlint/lint1/cgram.y b/usr.bin/xlint/lint1/cgram.y
index 6ce3a6976991..0a2fec3e2c8c 100644
--- a/usr.bin/xlint/lint1/cgram.y
+++ b/usr.bin/xlint/lint1/cgram.y
@@ -1,5 +1,5 @@
 %{
-/* $NetBSD: cgram.y,v 1.491 2024/03/09 13:54:47 rillig Exp $ */
+/* $NetBSD: cgram.y,v 1.492 2024/03/27 21:14:09 rillig Exp $ */
 
 /*
  * Copyright (c) 1996 Christopher G. Demetriou.  All Rights Reserved.
@@ -35,7 +35,7 @@
 
 #include <sys/cdefs.h>
 #if defined(__RCSID)
-__RCSID("$NetBSD: cgram.y,v 1.491 2024/03/09 13:54:47 rillig Exp $");
+__RCSID("$NetBSD: cgram.y,v 1.492 2024/03/27 21:14:09 rillig Exp $");
 #endif
 
 #include <limits.h>
@@ -651,6 +651,7 @@ argument_expression_list:
 		add_function_argument($$, $1);
 	}
 |	argument_expression_list T_COMMA assignment_expression {
+		$$ = $1;
 		add_function_argument($1, $3);
 	}
 ;