diff --git a/include/io/acpi.h b/include/io/acpi.h
index fb43fa7..be71541 100644
--- a/include/io/acpi.h
+++ b/include/io/acpi.h
@@ -206,7 +206,7 @@ struct SDT_MCFG_t {
   uint OEMRevision;
   uint creatorID;
   uint creatorRevision;
-  uint sdtEntry;
+  ulong reserved;
   
   ulong PCIConfigBaseAddress;
 };