diff --git a/reactos/ntoskrnl/mm/amd64/page.c b/reactos/ntoskrnl/mm/amd64/page.c
index 7117e86116a..ee73689bfd5 100644
--- a/reactos/ntoskrnl/mm/amd64/page.c
+++ b/reactos/ntoskrnl/mm/amd64/page.c
@@ -378,6 +378,16 @@ MmIsPagePresent(PEPROCESS Process, PVOID Address)
     return (BOOLEAN)Pte.u.Hard.Valid;
 }
 
+BOOLEAN
+NTAPI
+MmIsDisabledPage(PEPROCESS Process, PVOID Address)
+{
+    MMPTE Pte;
+    Pte.u.Long = MiGetPteValueForProcess(Process, Address);
+    __debugbreak(); // FIXME
+    return !Pte.u.Hard.Valid && !(Pte.u.Long & 0x800) && Pte.u.Hard.PageFrameNumber;
+}
+
 BOOLEAN
 NTAPI
 MmIsPageSwapEntry(PEPROCESS Process, PVOID Address)