diff --git a/reactos/ntoskrnl/vdm/vdmmain.c b/reactos/ntoskrnl/vdm/vdmmain.c
index e9136599791..eacc5b6d629 100644
--- a/reactos/ntoskrnl/vdm/vdmmain.c
+++ b/reactos/ntoskrnl/vdm/vdmmain.c
@@ -93,7 +93,7 @@ VdmpInitialize(PVOID ControlData)
     NTSTATUS Status;
     HANDLE PhysMemHandle;
     PVOID BaseAddress;
-    PVOID NullAddress = NULL;
+    volatile PVOID NullAddress = NULL;
     LARGE_INTEGER Offset;
     ULONG ViewSize;