diff --git a/include/acpi/acpi_table.h b/include/acpi/acpi_table.h
index a3b6725..20ac3b5 100644
--- a/include/acpi/acpi_table.h
+++ b/include/acpi/acpi_table.h
@@ -80,7 +80,7 @@
 };
 
 /* XSDT (Extended System Description Table) */
-struct acpi_xsdt {
+struct __packed acpi_xsdt {
 	struct acpi_table_header header;
 	u64 entry[MAX_ACPI_TABLES];
 };
diff --git a/test/dm/acpi.c b/test/dm/acpi.c
index 5236b39..7e661ee 100644
--- a/test/dm/acpi.c
+++ b/test/dm/acpi.c
@@ -747,3 +747,13 @@
 	return 0;
 }
 DM_TEST(dm_test_acpi_find_table, 0);
+
+/* Test offsets in RSDT, XSDT */
+static int dm_test_acpi_offsets(struct unit_test_state *uts)
+{
+	ut_asserteq(36, offsetof(struct acpi_rsdt, entry));
+	ut_asserteq(36, offsetof(struct acpi_xsdt, entry));
+
+	return 0;
+}
+DM_TEST(dm_test_acpi_offsets, 0);