diff --git a/reactos/ntoskrnl/mm/mm.c b/reactos/ntoskrnl/mm/mm.c
index 85001b0a288..1480c00d729 100644
--- a/reactos/ntoskrnl/mm/mm.c
+++ b/reactos/ntoskrnl/mm/mm.c
@@ -356,7 +356,8 @@ MmCommitPagedPoolAddress(PVOID Address, BOOLEAN Locked)
 ULONG NTAPI
 MmAdjustWorkingSetSize (ULONG Unknown0,
                         ULONG Unknown1,
-                        ULONG Unknown2)
+                        ULONG Unknown2,
+                        ULONG Unknown3)
 {
    UNIMPLEMENTED;
    return (0);
diff --git a/reactos/ntoskrnl/ntoskrnl_i386.def b/reactos/ntoskrnl/ntoskrnl_i386.def
index 919e539e0ca..28cf8b88b11 100644
--- a/reactos/ntoskrnl/ntoskrnl_i386.def
+++ b/reactos/ntoskrnl/ntoskrnl_i386.def
@@ -720,7 +720,7 @@ LsaRegisterLogonProcess@12
 Mm64BitPhysicalAddress DATA
 MmAddPhysicalMemory@8
 MmAddVerifierThunks@8
-MmAdjustWorkingSetSize@12
+MmAdjustWorkingSetSize@16
 MmAdvanceMdl@8
 MmAllocateContiguousMemory@12
 MmAllocateContiguousMemorySpecifyCache@32