diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index a84a5787bbd2db70160d471bd8686647f66f5fdf..9e702bc4960f0b3e279574e388027e5528b68034 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -31,11 +31,6 @@
 #define IORT_IOMMU_TYPE		((1 << ACPI_IORT_NODE_SMMU) |	\
 				(1 << ACPI_IORT_NODE_SMMU_V3))
 
-/* Until ACPICA headers cover IORT rev. C */
-#ifndef ACPI_IORT_SMMU_V3_CAVIUM_CN99XX
-#define ACPI_IORT_SMMU_V3_CAVIUM_CN99XX		0x2
-#endif
-
 struct iort_its_msi_chip {
 	struct list_head	list;
 	struct fwnode_handle	*fw_node;