diff --git a/src/d3d10/d3d10_device.cpp b/src/d3d10/d3d10_device.cpp
index e35e131a8..dfd0bdd08 100644
--- a/src/d3d10/d3d10_device.cpp
+++ b/src/d3d10/d3d10_device.cpp
@@ -8,7 +8,7 @@ namespace dxvk {
   D3D10Device::D3D10Device(
           D3D11Device*                      pDevice,
           D3D11ImmediateContext*            pContext)
-  : m_device(pDevice), m_context(pContext), m_multithread(this) {
+  : m_device(pDevice), m_context(pContext) {
     // Respecting the single-threaded flag may improve performance
     UINT flags = pDevice->GetCreationFlags();
     m_threadSafe = !(flags & D3D10_CREATE_DEVICE_SINGLETHREADED);
diff --git a/src/d3d10/d3d10_device.h b/src/d3d10/d3d10_device.h
index bdc8e7fab..df9d50fd7 100644
--- a/src/d3d10/d3d10_device.h
+++ b/src/d3d10/d3d10_device.h
@@ -1,9 +1,12 @@
 #pragma once
 
-#include "d3d10_multithread.h"
+#include "d3d10_include.h"
 
 namespace dxvk {
 
+  using D3D10DeviceMutex = sync::Spinlock;
+  using D3D10DeviceLock = std::unique_lock<D3D10DeviceMutex>;
+  
   class D3D11Device;
   class D3D11ImmediateContext;
 
@@ -470,10 +473,6 @@ namespace dxvk {
             UINT*                             pWidth,
             UINT*                             pHeight);
     
-    D3D10Multithread* GetMultithreadIface() {
-      return &m_multithread;
-    }
-    
     D3D10DeviceLock LockDevice() {
       return m_threadSafe
         ? D3D10DeviceLock(m_mutex)
@@ -485,7 +484,6 @@ namespace dxvk {
     D3D10DeviceMutex        m_mutex;
     D3D11Device*            m_device;
     D3D11ImmediateContext*  m_context;
-    D3D10Multithread        m_multithread;
 
     bool m_threadSafe = true;
 
diff --git a/src/d3d10/d3d10_multithread.cpp b/src/d3d10/d3d10_multithread.cpp
deleted file mode 100644
index 9f3949fdc..000000000
--- a/src/d3d10/d3d10_multithread.cpp
+++ /dev/null
@@ -1,42 +0,0 @@
-#include "d3d10_multithread.h"
-#include "d3d10_device.h"
-
-namespace dxvk {
-
-  HRESULT STDMETHODCALLTYPE D3D10Multithread::QueryInterface(
-          REFIID                    riid,
-          void**                    ppvObject) {
-    return m_device->QueryInterface(riid, ppvObject);
-  }
-
-  
-  ULONG STDMETHODCALLTYPE D3D10Multithread::AddRef() {
-    return m_device->AddRef();
-  }
-
-
-  ULONG STDMETHODCALLTYPE D3D10Multithread::Release() {
-    return m_device->Release();
-  }
-
-
-  void STDMETHODCALLTYPE D3D10Multithread::Enter() {
-    m_lock = m_device->LockDevice();
-  }
-
-
-  void STDMETHODCALLTYPE D3D10Multithread::Leave() {
-    m_lock.unlock();
-  }
-
-
-  BOOL STDMETHODCALLTYPE D3D10Multithread::GetMultithreadProtected() {
-    return m_enabled;
-  }
-
-
-  BOOL STDMETHODCALLTYPE D3D10Multithread::SetMultithreadProtected(BOOL Enable) {
-    return std::exchange(m_enabled, Enable);
-  }
-
-}
\ No newline at end of file
diff --git a/src/d3d10/d3d10_multithread.h b/src/d3d10/d3d10_multithread.h
deleted file mode 100644
index 81d5dbcec..000000000
--- a/src/d3d10/d3d10_multithread.h
+++ /dev/null
@@ -1,43 +0,0 @@
-#pragma once
-
-#include "d3d10_include.h"
-
-namespace dxvk {
-
-  using D3D10DeviceMutex = sync::Spinlock;
-  using D3D10DeviceLock = std::unique_lock<D3D10DeviceMutex>;
-  
-  class D3D10Device;
-
-  class D3D10Multithread : public ID3D10Multithread {
-
-  public:
-
-    D3D10Multithread(D3D10Device* pDevice)
-    : m_device(pDevice) { }
-
-    HRESULT STDMETHODCALLTYPE QueryInterface(
-            REFIID                    riid,
-            void**                    ppvObject);
-    
-    ULONG STDMETHODCALLTYPE AddRef();
-
-    ULONG STDMETHODCALLTYPE Release();
-
-    void STDMETHODCALLTYPE Enter();
-
-    void STDMETHODCALLTYPE Leave();
-
-    BOOL STDMETHODCALLTYPE GetMultithreadProtected();
-
-    BOOL STDMETHODCALLTYPE SetMultithreadProtected(BOOL Enable);
-
-  private:
-
-    D3D10Device*    m_device;
-    D3D10DeviceLock m_lock;
-    bool            m_enabled = true;
-
-  };
-
-}
\ No newline at end of file
diff --git a/src/d3d11/d3d11_device.cpp b/src/d3d11/d3d11_device.cpp
index 175b4de82..b5e13a5d5 100644
--- a/src/d3d11/d3d11_device.cpp
+++ b/src/d3d11/d3d11_device.cpp
@@ -61,11 +61,6 @@ namespace dxvk {
       return S_OK;
     }
     
-    if (riid == __uuidof(ID3D10Multithread)) {
-      *ppvObject = ref(m_d3d11Device->GetD3D10Interface()->GetMultithreadIface());
-      return S_OK;
-    }
-
     if (riid == __uuidof(ID3D11Device)
      || riid == __uuidof(ID3D11Device1)) {
       *ppvObject = ref(m_d3d11Device);
diff --git a/src/d3d11/meson.build b/src/d3d11/meson.build
index c0889b203..a8596b765 100644
--- a/src/d3d11/meson.build
+++ b/src/d3d11/meson.build
@@ -4,7 +4,6 @@ d3d10_src = [
   '../d3d10/d3d10_depth_stencil.cpp',
   '../d3d10/d3d10_device.cpp',
   '../d3d10/d3d10_input_layout.cpp',
-  '../d3d10/d3d10_multithread.cpp',
   '../d3d10/d3d10_query.cpp',
   '../d3d10/d3d10_rasterizer.cpp',
   '../d3d10/d3d10_sampler.cpp',