diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 374c129..d8e59a8 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -72,6 +72,7 @@
 
 LIST_HEAD(ioapic_map);
 LIST_HEAD(hpet_map);
+LIST_HEAD(acpihid_map);
 
 /*
  * Domain for untranslated devices - only allocated