diff --git a/src/acpi/acpi.c b/src/acpi/acpi.c
index e30b7d3..e357f6a 100644
--- a/src/acpi/acpi.c
+++ b/src/acpi/acpi.c
@@ -117,12 +117,11 @@
 	return CB_SUCCESS;
 }
 
-static int acpi_create_mcfg_mmconfig(acpi_mcfg_mmconfig_t *mmconfig, u32 base,
+static int acpi_create_mcfg_mmconfig(acpi_mcfg_mmconfig_t *mmconfig, u64 base,
 				u16 seg_nr, u8 start, u8 end)
 {
 	memset(mmconfig, 0, sizeof(*mmconfig));
 	mmconfig->base_address = base;
-	mmconfig->base_reserved = 0;
 	mmconfig->pci_segment_group_number = seg_nr;
 	mmconfig->start_bus_number = start;
 	mmconfig->end_bus_number = end;