diff --git a/src/acpi/acpidump/acpidump.c b/src/acpi/acpidump/acpidump.c
index 9ff28cb..2bd2ce5 100644
--- a/src/acpi/acpidump/acpidump.c
+++ b/src/acpi/acpidump/acpidump.c
@@ -953,22 +953,48 @@ static void acpidump_madt(fwts_framework *fw, const fwts_acpi_table_info *table)
 			}
 			break;
 		case FWTS_ACPI_MADT_GIC_C_CPU_INTERFACE: {
-				static const fwts_acpidump_field fields_madt_gic[] = {
-					FIELD_UINT("  Reserved", 	fwts_acpi_madt_gic, reserved),
-					FIELD_UINT("  GIC ID", 		fwts_acpi_madt_gic, gic_id),
-					FIELD_UINT("  Processor UID", 	fwts_acpi_madt_gic, processor_uid),
-					FIELD_UINT("  Flags", 		fwts_acpi_madt_gic, flags),
-					FIELD_UINT("  Parking Protocol",fwts_acpi_madt_gic, parking_protocol_version),
-					FIELD_UINT("  Perf. Int. GSIV",	fwts_acpi_madt_gic, performance_interrupt_gsiv),
-					FIELD_UINT("  Parked Address",	fwts_acpi_madt_gic, parked_address),
-					FIELD_UINT("  Phys. Base. Addr",fwts_acpi_madt_gic, physical_base_address),
-					FIELD_UINT("  GICV",		fwts_acpi_madt_gic, gicv),
-					FIELD_UINT("  GICH",		fwts_acpi_madt_gic, gich),
-					FIELD_UINT("  VGIC Interrupt",	fwts_acpi_madt_gic, vgic),
-					FIELD_UINT("  GICR Base. Addr", fwts_acpi_madt_gic, gicr_base_address),
-					FIELD_UINT("  MPIDR",		fwts_acpi_madt_gic, mpidr),
-				};
-				__acpi_dump_table_fields(fw, data, fields_madt_gic, offset);
+				/* ACPI 5.1 */
+				if (table->length == 76) {
+					static const fwts_acpidump_field fields_madt_gic[] = {
+						FIELD_UINT("  Reserved", 	fwts_acpi_madt_gic, reserved),
+						FIELD_UINT("  GIC ID", 		fwts_acpi_madt_gic, gic_id),
+						FIELD_UINT("  Processor UID", 	fwts_acpi_madt_gic, processor_uid),
+						FIELD_UINT("  Flags", 		fwts_acpi_madt_gic, flags),
+						FIELD_UINT("  Parking Protocol",fwts_acpi_madt_gic, parking_protocol_version),
+						FIELD_UINT("  Perf. Int. GSIV",	fwts_acpi_madt_gic, performance_interrupt_gsiv),
+						FIELD_UINT("  Parked Address",	fwts_acpi_madt_gic, parked_address),
+						FIELD_UINT("  Phys. Base. Addr",fwts_acpi_madt_gic, physical_base_address),
+						FIELD_UINT("  GICV",		fwts_acpi_madt_gic, gicv),
+						FIELD_UINT("  GICH",		fwts_acpi_madt_gic, gich),
+						FIELD_UINT("  VGIC Interrupt",	fwts_acpi_madt_gic, vgic),
+						FIELD_UINT("  GICR Base. Addr", fwts_acpi_madt_gic, gicr_base_address),
+						FIELD_UINT("  MPIDR",		fwts_acpi_madt_gic, mpidr),
+					};
+					__acpi_dump_table_fields(fw, data, fields_madt_gic, offset);
+				}
+
+				/* ACPI 6.0 */
+				if (table->length == 80) {
+					static const fwts_acpidump_field fields_madt_gic[] = {
+						FIELD_UINT("  Reserved", 	fwts_acpi_madt_gic, reserved),
+						FIELD_UINT("  GIC ID", 		fwts_acpi_madt_gic, gic_id),
+						FIELD_UINT("  Processor UID", 	fwts_acpi_madt_gic, processor_uid),
+						FIELD_UINT("  Flags", 		fwts_acpi_madt_gic, flags),
+						FIELD_UINT("  Parking Protocol",fwts_acpi_madt_gic, parking_protocol_version),
+						FIELD_UINT("  Perf. Int. GSIV",	fwts_acpi_madt_gic, performance_interrupt_gsiv),
+						FIELD_UINT("  Parked Address",	fwts_acpi_madt_gic, parked_address),
+						FIELD_UINT("  Phys. Base. Addr",fwts_acpi_madt_gic, physical_base_address),
+						FIELD_UINT("  GICV",		fwts_acpi_madt_gic, gicv),
+						FIELD_UINT("  GICH",		fwts_acpi_madt_gic, gich),
+						FIELD_UINT("  VGIC Interrupt",	fwts_acpi_madt_gic, vgic),
+						FIELD_UINT("  GICR Base. Addr", fwts_acpi_madt_gic, gicr_base_address),
+						FIELD_UINT("  MPIDR",		fwts_acpi_madt_gic, mpidr),
+						FIELD_UINT("  Processor Power Efficiency Class",	fwts_acpi_madt_gic, processor_power_efficiency_class),
+						FIELD_UINTS("  Reserved", 	fwts_acpi_madt_gic, reserved2),
+					};
+					__acpi_dump_table_fields(fw, data, fields_madt_gic, offset);
+				}
+
 				skip = sizeof(fwts_acpi_madt_gic);
 			}
 			break;
diff --git a/src/acpi/madt/madt.c b/src/acpi/madt/madt.c
index 8afceb6..f776745 100644
--- a/src/acpi/madt/madt.c
+++ b/src/acpi/madt/madt.c
@@ -235,6 +235,18 @@ static int madt_test1(fwts_framework *fw)
 						gic->flags & 0xfffffffc);
 				}
 				skip = sizeof(fwts_acpi_madt_gic);
+
+				// new in ACPI 6.0
+				if (table->length == 80) {
+					uint32_t gic_reserve2 = gic->reserved2[0] + (gic->reserved2[1] << 4) + (gic->reserved2[2] << 8);
+					if (gic_reserve2) {
+						passed = false;
+						fwts_failed(fw, LOG_LEVEL_LOW,
+							"MADTGICCReserved2NonZero",
+							"MADT GICC Structure second reserved field should be zero, "
+							"instead got 0x%" PRIx32 ".", gic_reserve2);
+					}
+				}
 			}
 			break;
 		case FWTS_ACPI_MADT_GIC_D_GOC_DISTRIBUTOR: {
diff --git a/src/lib/include/fwts_acpi.h b/src/lib/include/fwts_acpi.h
index e78af1c..37cc879 100644
--- a/src/lib/include/fwts_acpi.h
+++ b/src/lib/include/fwts_acpi.h
@@ -472,6 +472,8 @@ typedef struct {
 	uint32_t	vgic;
 	uint64_t	gicr_base_address;
 	uint64_t	mpidr;
+	uint8_t		processor_power_efficiency_class;
+	uint8_t		reserved2[3];
 } __attribute__ ((packed)) fwts_acpi_madt_gic;
 
 /* New in ACPI 5.0, GICD, section 5.2.12.15 */
