diff --git a/reactos/ntoskrnl/ke/thrdobj.c b/reactos/ntoskrnl/ke/thrdobj.c
index b948f835e82..b3193c3bfcc 100644
--- a/reactos/ntoskrnl/ke/thrdobj.c
+++ b/reactos/ntoskrnl/ke/thrdobj.c
@@ -697,12 +697,6 @@ KeInitThread(IN OUT PKTHREAD Thread,
     Thread->StackLimit = (ULONG_PTR)KernelStack - KERNEL_STACK_SIZE;
     Thread->KernelStackResident = TRUE;
 
-    /* ROS Mm HACK */
-    MmUpdatePageDir((PEPROCESS)Process,
-                    (PVOID)Thread->StackLimit,
-                    KERNEL_STACK_SIZE);
-    MmUpdatePageDir((PEPROCESS)Process, (PVOID)Thread, sizeof(ETHREAD));
-
     /* Enter SEH to avoid crashes due to user mode */
     Status = STATUS_SUCCESS;
     _SEH_TRY
diff --git a/reactos/ntoskrnl/ke/thrdschd.c b/reactos/ntoskrnl/ke/thrdschd.c
index dad5c83c546..22679d26bdd 100644
--- a/reactos/ntoskrnl/ke/thrdschd.c
+++ b/reactos/ntoskrnl/ke/thrdschd.c
@@ -150,8 +150,6 @@ KiDispatchThreadNoLock(ULONG NewThreadStatus)
                 KiIdleSummary |= Affinity;
             }
 
-            MmUpdatePageDir((PEPROCESS)PsGetCurrentProcess(),((PETHREAD)CurrentThread)->ThreadsProcess, sizeof(EPROCESS));
-
             /* Special note for Filip: This will release the Dispatcher DB Lock ;-) -- Alex */
             DPRINT("You are : %x, swapping to: %x.\n", OldThread, CurrentThread);
             ApcState = KiSwapContext(OldThread, CurrentThread);