diff --git a/dlls/d3d10core/d3d10core_private.h b/dlls/d3d10core/d3d10core_private.h
index 32d485d413d..9811315b2c8 100644
--- a/dlls/d3d10core/d3d10core_private.h
+++ b/dlls/d3d10core/d3d10core_private.h
@@ -236,7 +236,7 @@ HRESULT d3d10_rasterizer_state_init(struct d3d10_rasterizer_state *state) DECLSP
 /* ID3D10SamplerState */
 struct d3d10_sampler_state
 {
-    const struct ID3D10SamplerStateVtbl *vtbl;
+    ID3D10SamplerState ID3D10SamplerState_iface;
     LONG refcount;
 };
 
diff --git a/dlls/d3d10core/device.c b/dlls/d3d10core/device.c
index 3523fe0fec6..6af93aee9eb 100644
--- a/dlls/d3d10core/device.c
+++ b/dlls/d3d10core/device.c
@@ -1055,7 +1055,7 @@ static HRESULT STDMETHODCALLTYPE d3d10_device_CreateSamplerState(ID3D10Device *i
     }
 
     TRACE("Created sampler state %p.\n", object);
-    *sampler_state = (ID3D10SamplerState *)object;
+    *sampler_state = &object->ID3D10SamplerState_iface;
 
     return S_OK;
 }
diff --git a/dlls/d3d10core/state.c b/dlls/d3d10core/state.c
index 4e77b1df865..edb20307007 100644
--- a/dlls/d3d10core/state.c
+++ b/dlls/d3d10core/state.c
@@ -372,6 +372,11 @@ HRESULT d3d10_rasterizer_state_init(struct d3d10_rasterizer_state *state)
     return S_OK;
 }
 
+static inline struct d3d10_sampler_state *impl_from_ID3D10SamplerState(ID3D10SamplerState *iface)
+{
+    return CONTAINING_RECORD(iface, struct d3d10_sampler_state, ID3D10SamplerState_iface);
+}
+
 /* IUnknown methods */
 
 static HRESULT STDMETHODCALLTYPE d3d10_sampler_state_QueryInterface(ID3D10SamplerState *iface,
@@ -396,7 +401,7 @@ static HRESULT STDMETHODCALLTYPE d3d10_sampler_state_QueryInterface(ID3D10Sample
 
 static ULONG STDMETHODCALLTYPE d3d10_sampler_state_AddRef(ID3D10SamplerState *iface)
 {
-    struct d3d10_sampler_state *This = (struct d3d10_sampler_state *)iface;
+    struct d3d10_sampler_state *This = impl_from_ID3D10SamplerState(iface);
     ULONG refcount = InterlockedIncrement(&This->refcount);
 
     TRACE("%p increasing refcount to %u.\n", This, refcount);
@@ -406,7 +411,7 @@ static ULONG STDMETHODCALLTYPE d3d10_sampler_state_AddRef(ID3D10SamplerState *if
 
 static ULONG STDMETHODCALLTYPE d3d10_sampler_state_Release(ID3D10SamplerState *iface)
 {
-    struct d3d10_sampler_state *This = (struct d3d10_sampler_state *)iface;
+    struct d3d10_sampler_state *This = impl_from_ID3D10SamplerState(iface);
     ULONG refcount = InterlockedDecrement(&This->refcount);
 
     TRACE("%p decreasing refcount to %u.\n", This, refcount);
@@ -477,7 +482,7 @@ static const struct ID3D10SamplerStateVtbl d3d10_sampler_state_vtbl =
 
 HRESULT d3d10_sampler_state_init(struct d3d10_sampler_state *state)
 {
-    state->vtbl = &d3d10_sampler_state_vtbl;
+    state->ID3D10SamplerState_iface.lpVtbl = &d3d10_sampler_state_vtbl;
     state->refcount = 1;
 
     return S_OK;