diff --git a/dlls/d3d9/vertexshader.c b/dlls/d3d9/vertexshader.c
index d66c12c78c4..8c73d3fd055 100644
--- a/dlls/d3d9/vertexshader.c
+++ b/dlls/d3d9/vertexshader.c
@@ -56,7 +56,9 @@ static ULONG WINAPI IDirect3DVertexShader9Impl_Release(LPDIRECT3DVERTEXSHADER9 i
     TRACE("(%p) : ReleaseRef to %d\n", This, ref);
 
     if (ref == 0) {
+        EnterCriticalSection(&d3d9_cs);
         IWineD3DVertexShader_Release(This->wineD3DVertexShader);
+        LeaveCriticalSection(&d3d9_cs);
         IUnknown_Release(This->parentDevice);
         HeapFree(GetProcessHeap(), 0, This);
     }
@@ -70,21 +72,27 @@ static HRESULT WINAPI IDirect3DVertexShader9Impl_GetDevice(LPDIRECT3DVERTEXSHADE
     HRESULT hr = D3D_OK;
     TRACE("(%p) : Relay\n", This);
 
+    EnterCriticalSection(&d3d9_cs);
     if (D3D_OK == (hr = IWineD3DVertexShader_GetDevice(This->wineD3DVertexShader, &myDevice) && myDevice != NULL)) {
         hr = IWineD3DDevice_GetParent(myDevice, (IUnknown **)ppDevice);
         IWineD3DDevice_Release(myDevice);
     } else {
         *ppDevice = NULL;
     }
+    LeaveCriticalSection(&d3d9_cs);
     TRACE("(%p) returning (%p)\n", This, *ppDevice);
     return hr;
 }
 
 static HRESULT WINAPI IDirect3DVertexShader9Impl_GetFunction(LPDIRECT3DVERTEXSHADER9 iface, VOID* pData, UINT* pSizeOfData) {
     IDirect3DVertexShader9Impl *This = (IDirect3DVertexShader9Impl *)iface;
-
+    HRESULT hr;
     TRACE("(%p) : Relay\n", This);
-    return IWineD3DVertexShader_GetFunction(This->wineD3DVertexShader, pData, pSizeOfData);
+
+    EnterCriticalSection(&d3d9_cs);
+    hr = IWineD3DVertexShader_GetFunction(This->wineD3DVertexShader, pData, pSizeOfData);
+    LeaveCriticalSection(&d3d9_cs);
+    return hr;
 }
 
 
@@ -116,7 +124,9 @@ HRESULT WINAPI IDirect3DDevice9Impl_CreateVertexShader(LPDIRECT3DDEVICE9 iface,
 
     object->ref = 1;
     object->lpVtbl = &Direct3DVertexShader9_Vtbl;
+    EnterCriticalSection(&d3d9_cs);
     hrc= IWineD3DDevice_CreateVertexShader(This->WineD3DDevice, NULL /* declaration */, pFunction, &object->wineD3DVertexShader, (IUnknown *)object);
+    LeaveCriticalSection(&d3d9_cs);
 
     if (FAILED(hrc)) {
 
@@ -139,7 +149,9 @@ HRESULT WINAPI IDirect3DDevice9Impl_SetVertexShader(LPDIRECT3DDEVICE9 iface, IDi
     HRESULT hrc = D3D_OK;
 
     TRACE("(%p) : Relay\n", This);
+    EnterCriticalSection(&d3d9_cs);
     hrc =  IWineD3DDevice_SetVertexShader(This->WineD3DDevice, pShader==NULL?NULL:((IDirect3DVertexShader9Impl *)pShader)->wineD3DVertexShader);
+    LeaveCriticalSection(&d3d9_cs);
 
     TRACE("(%p) : returning hr(%u)\n", This, hrc);
     return hrc;
@@ -151,6 +163,7 @@ HRESULT WINAPI IDirect3DDevice9Impl_GetVertexShader(LPDIRECT3DDEVICE9 iface, IDi
     HRESULT hrc = D3D_OK;
 
     TRACE("(%p) : Relay  device@%p\n", This, This->WineD3DDevice);
+    EnterCriticalSection(&d3d9_cs);
     hrc = IWineD3DDevice_GetVertexShader(This->WineD3DDevice, &pShader);
     if(hrc == D3D_OK && pShader != NULL){
        hrc = IWineD3DVertexShader_GetParent(pShader, (IUnknown **)ppShader);
@@ -158,42 +171,73 @@ HRESULT WINAPI IDirect3DDevice9Impl_GetVertexShader(LPDIRECT3DDEVICE9 iface, IDi
     } else {
         WARN("(%p) : Call to IWineD3DDevice_GetVertexShader failed %u (device %p)\n", This, hrc, This->WineD3DDevice);
     }
+    LeaveCriticalSection(&d3d9_cs);
     TRACE("(%p) : returning %p\n", This, *ppShader);
     return hrc;
 }
 
 HRESULT WINAPI IDirect3DDevice9Impl_SetVertexShaderConstantF(LPDIRECT3DDEVICE9 iface, UINT Register, CONST float* pConstantData, UINT Vector4fCount) {
     IDirect3DDevice9Impl *This = (IDirect3DDevice9Impl *)iface;
+    HRESULT hr;
     TRACE("(%p) : Relay\n", This);
-    return IWineD3DDevice_SetVertexShaderConstantF(This->WineD3DDevice, Register, pConstantData, Vector4fCount);
+
+    EnterCriticalSection(&d3d9_cs);
+    hr = IWineD3DDevice_SetVertexShaderConstantF(This->WineD3DDevice, Register, pConstantData, Vector4fCount);
+    LeaveCriticalSection(&d3d9_cs);
+    return hr;
 }
 
 HRESULT WINAPI IDirect3DDevice9Impl_GetVertexShaderConstantF(LPDIRECT3DDEVICE9 iface, UINT Register, float* pConstantData, UINT Vector4fCount) {
     IDirect3DDevice9Impl *This = (IDirect3DDevice9Impl *)iface;
+    HRESULT hr;
+
     TRACE("(%p) : Relay\n", This);
-    return IWineD3DDevice_GetVertexShaderConstantF(This->WineD3DDevice, Register, pConstantData, Vector4fCount);
+    EnterCriticalSection(&d3d9_cs);
+    hr = IWineD3DDevice_GetVertexShaderConstantF(This->WineD3DDevice, Register, pConstantData, Vector4fCount);
+    LeaveCriticalSection(&d3d9_cs);
+    return hr;
 }
 
 HRESULT WINAPI IDirect3DDevice9Impl_SetVertexShaderConstantI(LPDIRECT3DDEVICE9 iface, UINT Register, CONST int* pConstantData, UINT Vector4iCount) {
     IDirect3DDevice9Impl *This = (IDirect3DDevice9Impl *)iface;
+    HRESULT hr;
     TRACE("(%p) : Relay\n", This);
-    return IWineD3DDevice_SetVertexShaderConstantI(This->WineD3DDevice, Register, pConstantData, Vector4iCount);
+
+    EnterCriticalSection(&d3d9_cs);
+    hr = IWineD3DDevice_SetVertexShaderConstantI(This->WineD3DDevice, Register, pConstantData, Vector4iCount);
+    LeaveCriticalSection(&d3d9_cs);
+    return hr;
 }
 
 HRESULT WINAPI IDirect3DDevice9Impl_GetVertexShaderConstantI(LPDIRECT3DDEVICE9 iface, UINT Register, int* pConstantData, UINT Vector4iCount) {
     IDirect3DDevice9Impl *This = (IDirect3DDevice9Impl *)iface;
+    HRESULT hr;
     TRACE("(%p) : Relay\n", This);
-    return IWineD3DDevice_GetVertexShaderConstantI(This->WineD3DDevice, Register, pConstantData, Vector4iCount);
+
+    EnterCriticalSection(&d3d9_cs);
+    hr = IWineD3DDevice_GetVertexShaderConstantI(This->WineD3DDevice, Register, pConstantData, Vector4iCount);
+    LeaveCriticalSection(&d3d9_cs);
+    return hr;
 }
 
 HRESULT WINAPI IDirect3DDevice9Impl_SetVertexShaderConstantB(LPDIRECT3DDEVICE9 iface, UINT Register, CONST BOOL* pConstantData, UINT BoolCount) {
     IDirect3DDevice9Impl *This = (IDirect3DDevice9Impl *)iface;
+    HRESULT hr;
     TRACE("(%p) : Relay\n", This);
-    return IWineD3DDevice_SetVertexShaderConstantB(This->WineD3DDevice, Register, pConstantData, BoolCount);
+
+    EnterCriticalSection(&d3d9_cs);
+    hr = IWineD3DDevice_SetVertexShaderConstantB(This->WineD3DDevice, Register, pConstantData, BoolCount);
+    LeaveCriticalSection(&d3d9_cs);
+    return hr;
 }
 
 HRESULT WINAPI IDirect3DDevice9Impl_GetVertexShaderConstantB(LPDIRECT3DDEVICE9 iface, UINT Register, BOOL* pConstantData, UINT BoolCount) {
     IDirect3DDevice9Impl *This = (IDirect3DDevice9Impl *)iface;
+    HRESULT hr;
     TRACE("(%p) : Relay\n", This);
-    return IWineD3DDevice_GetVertexShaderConstantB(This->WineD3DDevice, Register, pConstantData, BoolCount);
+
+    EnterCriticalSection(&d3d9_cs);
+    hr = IWineD3DDevice_GetVertexShaderConstantB(This->WineD3DDevice, Register, pConstantData, BoolCount);
+    LeaveCriticalSection(&d3d9_cs);
+    return hr;
 }