diff --git a/include/acpi/actbl2.h b/include/acpi/actbl2.h
index 860e5c883eb3..21314d37cb07 100644
--- a/include/acpi/actbl2.h
+++ b/include/acpi/actbl2.h
@@ -516,7 +516,7 @@ struct acpi_dmar_andd {
 	struct acpi_dmar_header header;
 	u8 reserved[3];
 	u8 device_number;
-	u8 object_name[];
+	char object_name[1];
 };
 
 /*******************************************************************************