diff --git a/subsystems/ntvdm/ntvdm.h b/subsystems/ntvdm/ntvdm.h
index 4f4f0323669..b82ed4d6be0 100644
--- a/subsystems/ntvdm/ntvdm.h
+++ b/subsystems/ntvdm/ntvdm.h
@@ -25,7 +25,10 @@
 #define MAX_SEGMENT 0xFFFF
 #define MAX_OFFSET 0xFFFF
 #define MAX_ADDRESS TO_LINEAR(MAX_SEGMENT, MAX_OFFSET)
-#define FAR_POINTER(x) ((ULONG_PTR)BaseAddress + TO_LINEAR(HIWORD(x), LOWORD(x)))
+
+#define FAR_POINTER(x)              ((ULONG_PTR)BaseAddress + TO_LINEAR(HIWORD(x), LOWORD(x)))
+#define SEG_OFF_TO_PTR(seg, off)    ((ULONG_PTR)BaseAddress + TO_LINEAR((seg), (off)))
+
 #define STEPS_PER_CYCLE 256
 
 /* FUNCTIONS ******************************************************************/