diff --git a/usr.sbin/acpidump/acpidump.c b/usr.sbin/acpidump/acpidump.c
index e08a6edada9..8171b8f9bed 100644
--- a/usr.sbin/acpidump/acpidump.c
+++ b/usr.sbin/acpidump/acpidump.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: acpidump.c,v 1.24 2021/07/12 15:09:20 beck Exp $	*/
+/*	$OpenBSD: acpidump.c,v 1.25 2022/09/11 10:40:35 kettenis Exp $	*/
 /*
  * Copyright (c) 2000 Mitsuru IWASAKI <iwasaki@FreeBSD.org>
  * All rights reserved.
@@ -714,8 +714,8 @@ efi_acpi_addr(void)
 	kd = kvm_openfiles(NULL, NULL, NULL, O_RDONLY, NULL);
 	if (kd == NULL)
 		goto on_error;
-	nl[0].n_name = "efi_acpi_table";
-	if (kvm_nlist(kd, nl) == -1)
+	nl[0].n_name = "_efi_acpi_table";
+	if (kvm_nlist(kd, nl) != 0)
 		goto on_error;
 	if (kvm_read(kd, nl[0].n_value, &table, sizeof(table)) == -1)
 		goto on_error;
@@ -746,7 +746,7 @@ efi_acpi_addr(void)
 	if (kd == NULL)
 		goto on_error;
 	nl[0].n_name = "_bios_efiinfo";
-	if (kvm_nlist(kd, nl) == -1)
+	if (kvm_nlist(kd, nl) != 0)
 		goto on_error;
 	if (kvm_read(kd, nl[0].n_value, &ptr, sizeof(ptr)) == -1)
 		goto on_error;