diff --git a/import/OpenXDK/include/xboxkrnl/mm.h b/import/OpenXDK/include/xboxkrnl/mm.h
index 704d739cc..ac7eac26c 100644
--- a/import/OpenXDK/include/xboxkrnl/mm.h
+++ b/import/OpenXDK/include/xboxkrnl/mm.h
@@ -96,7 +96,7 @@ XBSYSAPI EXPORTNUM(173) PHYSICAL_ADDRESS NTAPI MmGetPhysicalAddress
 XBSYSAPI VOID *MmIsAddressValid;
 
 //XBSYSAPI VOID *MmLockUnlockBufferPages;
-XBSYSAPI EXPORTNUM(175) PHYSICAL_ADDRESS NTAPI MmLockUnlockBufferPages
+XBSYSAPI EXPORTNUM(175) VOID NTAPI MmLockUnlockBufferPages
 (
     IN PHYSICAL_ADDRESS   BaseAddress,
     IN ULONG            NumberOfBytes,
diff --git a/src/CxbxKrnl/EmuKrnl.cpp b/src/CxbxKrnl/EmuKrnl.cpp
index cbb503434..b795592f4 100644
--- a/src/CxbxKrnl/EmuKrnl.cpp
+++ b/src/CxbxKrnl/EmuKrnl.cpp
@@ -2742,6 +2742,28 @@ XBSYSAPI EXPORTNUM(172) xboxkrnl::NTSTATUS NTAPI xboxkrnl::MmFreeSystemMemory
     return STATUS_SUCCESS;
 }
 
+// ******************************************************************
+// * 0x00AF - MmLockUnlockBufferPages
+// ******************************************************************
+XBSYSAPI EXPORTNUM(175) void NTAPI xboxkrnl::MmLockUnlockBufferPages
+(
+	IN PHYSICAL_ADDRESS	BaseAddress,
+	IN ULONG			NumberOfBytes,
+	IN ULONG			Protect
+)
+{
+	DbgPrintf("EmuKrnl (0x%X): MmLockUnlockBufferPages\n"
+		"(\n"
+		"   BaseAddress          : 0x%.08X\n"
+		"   NumberOfBytes        : 0x%.08X\n"
+		"   Protect				 : 0x%.08X\n"
+		");\n",
+		GetCurrentThreadId(), BaseAddress, NumberOfBytes, Protect);
+
+
+	EmuWarning("EmuKrnl: MmLockUnlockBufferPages ignored");
+}
+
 // ******************************************************************
 // * 0x00B1 - MmMapIoSpace
 // ******************************************************************
diff --git a/src/CxbxKrnl/KernelThunk.cpp b/src/CxbxKrnl/KernelThunk.cpp
index 49804d2a0..561a1bd53 100644
--- a/src/CxbxKrnl/KernelThunk.cpp
+++ b/src/CxbxKrnl/KernelThunk.cpp
@@ -232,7 +232,7 @@ extern "C" CXBXKRNL_API uint32 CxbxKrnl_KernelThunkTable[367] =
     (uint32)&xboxkrnl::MmFreeSystemMemory,          // 0x00AC (172)
     (uint32)PANIC(0x00AD),                          // 0x00AD (173) MmGetPhysicalAddress
     (uint32)PANIC(0x00AE),                          // 0x00AE (174) MmIsAddressValid
-    (uint32)PANIC(0x00AF),                          // 0x00AF (175) MmLockUnlockBufferPages
+    (uint32)&xboxkrnl::MmLockUnlockBufferPages,     // 0x00AF (175) MmLockUnlockBufferPages
     (uint32)PANIC(0x00B0),                          // 0x00B0 (176) MmLockUnlockPhysicalPage
     (uint32)&xboxkrnl::MmMapIoSpace,                // 0x00B1 (177)
     (uint32)&xboxkrnl::MmPersistContiguousMemory,   // 0x00B2 (178)