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-rw-r--r--src/arch/x86/acpi.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/arch/x86/acpi.c b/src/arch/x86/acpi.c
index a21bae2a36..5640ad0654 100644
--- a/src/arch/x86/acpi.c
+++ b/src/arch/x86/acpi.c
@@ -411,7 +411,7 @@ void acpi_create_dmar(acpi_dmar_t *dmar, enum dmar_flags flags,
header->length = sizeof(acpi_dmar_t);
header->revision = 1;
- dmar->host_address_width = 40 - 1; /* FIXME: == MTRR size? */
+ dmar->host_address_width = cpu_phys_address_size() - 1;
dmar->flags = flags;
current = acpi_fill_dmar(current);