diff --git a/include/grub/acpi.h b/include/grub/acpi.h
index 17aadb802..f2862da74 100644
--- a/include/grub/acpi.h
+++ b/include/grub/acpi.h
@@ -81,6 +81,7 @@ struct grub_acpi_fadt
 
 #define GRUB_ACPI_MADT_SIGNATURE "APIC"
 
+/* Note: here GRUB_PACKED is not needed because we have grub_uint8_t only. */
 struct grub_acpi_madt_entry_header
 {
   grub_uint8_t type;
@@ -112,7 +113,7 @@ struct grub_acpi_madt_entry_lapic
   grub_uint8_t acpiid;
   grub_uint8_t apicid;
   grub_uint32_t flags;
-};
+} GRUB_PACKED;
 
 struct grub_acpi_madt_entry_ioapic
 {
@@ -121,7 +122,7 @@ struct grub_acpi_madt_entry_ioapic
   grub_uint8_t pad;
   grub_uint32_t address;
   grub_uint32_t global_sys_interrupt;
-};
+} GRUB_PACKED;
 
 struct grub_acpi_madt_entry_interrupt_override
 {
@@ -148,7 +149,7 @@ struct grub_acpi_madt_entry_sapic
   grub_uint8_t pad;
   grub_uint32_t global_sys_interrupt_base;
   grub_uint64_t addr;
-};
+} GRUB_PACKED;
 
 struct grub_acpi_madt_entry_lsapic
 {
@@ -160,7 +161,7 @@ struct grub_acpi_madt_entry_lsapic
   grub_uint32_t flags;
   grub_uint32_t cpu_uid;
   grub_uint8_t cpu_uid_str[0];
-};
+} GRUB_PACKED;
 
 struct grub_acpi_madt_entry_platform_int_source
 {
@@ -172,7 +173,7 @@ struct grub_acpi_madt_entry_platform_int_source
   grub_uint8_t sapic_vector;
   grub_uint32_t global_sys_int;
   grub_uint32_t src_flags;
-};
+} GRUB_PACKED;
 
 enum
   {