diff --git a/dlls/d3d10/d3d10.spec b/dlls/d3d10/d3d10.spec
index baa0c10d0b3..1a09f4a056e 100644
--- a/dlls/d3d10/d3d10.spec
+++ b/dlls/d3d10/d3d10.spec
@@ -20,7 +20,7 @@
 @ stdcall D3D10ReflectShader(ptr long ptr)
 @ stub D3D10RegisterLayers
 @ stdcall D3D10StateBlockMaskDifference(ptr ptr ptr)
-@ stub D3D10StateBlockMaskDisableAll
+@ stdcall D3D10StateBlockMaskDisableAll(ptr)
 @ stub D3D10StateBlockMaskDisableCapture
 @ stub D3D10StateBlockMaskEnableAll
 @ stub D3D10StateBlockMaskEnableCapture
diff --git a/dlls/d3d10/stateblock.c b/dlls/d3d10/stateblock.c
index f121a5c495a..76a27f92b61 100644
--- a/dlls/d3d10/stateblock.c
+++ b/dlls/d3d10/stateblock.c
@@ -166,3 +166,15 @@ HRESULT WINAPI D3D10StateBlockMaskDifference(D3D10_STATE_BLOCK_MASK *mask_x,
 
     return S_OK;
 }
+
+HRESULT WINAPI D3D10StateBlockMaskDisableAll(D3D10_STATE_BLOCK_MASK *mask)
+{
+    TRACE("mask %p.\n", mask);
+
+    if (!mask)
+        return E_INVALIDARG;
+
+    memset(mask, 0, sizeof(*mask));
+
+    return S_OK;
+}
diff --git a/dlls/d3d10/tests/device.c b/dlls/d3d10/tests/device.c
index 1fc3a3bc6cb..21970027875 100644
--- a/dlls/d3d10/tests/device.c
+++ b/dlls/d3d10/tests/device.c
@@ -88,6 +88,14 @@ static void test_stateblock_mask(void)
     ok(hr == E_INVALIDARG, "Got unexpect hr %#x.\n", hr);
     hr = D3D10StateBlockMaskDifference(&mask_x, &mask_y, NULL);
     ok(hr == E_INVALIDARG, "Got unexpect hr %#x.\n", hr);
+
+    memset(&result, 0xff, sizeof(result));
+    hr = D3D10StateBlockMaskDisableAll(&result);
+    ok(SUCCEEDED(hr), "D3D10StateBlockMaskDisableAll failed, hr %#x.\n", hr);
+    ok(!result.VS, "Got unexpected result.VS %#x.\n", result.VS);
+    ok(!result.Predication, "Got unexpected result.Predication %#x.\n", result.Predication);
+    hr = D3D10StateBlockMaskDisableAll(NULL);
+    ok(hr == E_INVALIDARG, "Got unexpect hr %#x.\n", hr);
 }
 
 START_TEST(device)
diff --git a/include/d3d10effect.h b/include/d3d10effect.h
index d36c3dad4c2..e293d3bd650 100644
--- a/include/d3d10effect.h
+++ b/include/d3d10effect.h
@@ -806,6 +806,7 @@ HRESULT WINAPI D3D10CreateStateBlock(ID3D10Device *device,
 
 HRESULT WINAPI D3D10StateBlockMaskDifference(D3D10_STATE_BLOCK_MASK *mask_x,
         D3D10_STATE_BLOCK_MASK *mask_y, D3D10_STATE_BLOCK_MASK *result);
+HRESULT WINAPI D3D10StateBlockMaskDisableAll(D3D10_STATE_BLOCK_MASK *mask);
 
 #ifdef __cplusplus
 }