diff --git a/dlls/d3d8/device.c b/dlls/d3d8/device.c
index 36b8a7e3426..b4179eb1911 100644
--- a/dlls/d3d8/device.c
+++ b/dlls/d3d8/device.c
@@ -1308,16 +1308,15 @@ static HRESULT WINAPI d3d8_device_MultiplyTransform(IDirect3DDevice8 *iface,
 static HRESULT WINAPI d3d8_device_SetViewport(IDirect3DDevice8 *iface, const D3DVIEWPORT8 *viewport)
 {
     struct d3d8_device *device = impl_from_IDirect3DDevice8(iface);
-    HRESULT hr;
 
     TRACE("iface %p, viewport %p.\n", iface, viewport);
 
     /* Note: D3DVIEWPORT8 is compatible with struct wined3d_viewport. */
     wined3d_mutex_lock();
-    hr = wined3d_device_set_viewport(device->wined3d_device, (const struct wined3d_viewport *)viewport);
+    wined3d_device_set_viewport(device->wined3d_device, (const struct wined3d_viewport *)viewport);
     wined3d_mutex_unlock();
 
-    return hr;
+    return D3D_OK;
 }
 
 static HRESULT WINAPI d3d8_device_GetViewport(IDirect3DDevice8 *iface, D3DVIEWPORT8 *viewport)
diff --git a/dlls/d3d9/device.c b/dlls/d3d9/device.c
index 0399ba350d3..6922e81c44f 100644
--- a/dlls/d3d9/device.c
+++ b/dlls/d3d9/device.c
@@ -1374,16 +1374,15 @@ static HRESULT WINAPI d3d9_device_MultiplyTransform(IDirect3DDevice9Ex *iface,
 static HRESULT WINAPI d3d9_device_SetViewport(IDirect3DDevice9Ex *iface, const D3DVIEWPORT9 *viewport)
 {
     struct d3d9_device *device = impl_from_IDirect3DDevice9Ex(iface);
-    HRESULT hr;
 
     TRACE("iface %p, viewport %p.\n", iface, viewport);
 
     /* Note: D3DVIEWPORT9 is compatible with struct wined3d_viewport. */
     wined3d_mutex_lock();
-    hr = wined3d_device_set_viewport(device->wined3d_device, (const struct wined3d_viewport *)viewport);
+    wined3d_device_set_viewport(device->wined3d_device, (const struct wined3d_viewport *)viewport);
     wined3d_mutex_unlock();
 
-    return hr;
+    return D3D_OK;
 }
 
 static HRESULT WINAPI d3d9_device_GetViewport(IDirect3DDevice9Ex *iface, D3DVIEWPORT9 *viewport)
diff --git a/dlls/ddraw/device.c b/dlls/ddraw/device.c
index 24bd9938191..aec30de7961 100644
--- a/dlls/ddraw/device.c
+++ b/dlls/ddraw/device.c
@@ -4992,7 +4992,6 @@ static HRESULT WINAPI d3d_device7_Clear_FPUPreserve(IDirect3DDevice7 *iface, DWO
 static HRESULT d3d_device7_SetViewport(IDirect3DDevice7 *iface, D3DVIEWPORT7 *viewport)
 {
     struct d3d_device *device = impl_from_IDirect3DDevice7(iface);
-    HRESULT hr;
 
     TRACE("iface %p, viewport %p.\n", iface, viewport);
 
@@ -5001,10 +5000,10 @@ static HRESULT d3d_device7_SetViewport(IDirect3DDevice7 *iface, D3DVIEWPORT7 *vi
 
     /* Note: D3DVIEWPORT7 is compatible with struct wined3d_viewport. */
     wined3d_mutex_lock();
-    hr = wined3d_device_set_viewport(device->wined3d_device, (struct wined3d_viewport *)viewport);
+    wined3d_device_set_viewport(device->wined3d_device, (struct wined3d_viewport *)viewport);
     wined3d_mutex_unlock();
 
-    return hr;
+    return D3D_OK;
 }
 
 static HRESULT WINAPI d3d_device7_SetViewport_FPUSetup(IDirect3DDevice7 *iface, D3DVIEWPORT7 *viewport)
diff --git a/dlls/wined3d/device.c b/dlls/wined3d/device.c
index 7a57195720b..7753ae4d867 100644
--- a/dlls/wined3d/device.c
+++ b/dlls/wined3d/device.c
@@ -2291,7 +2291,7 @@ INT CDECL wined3d_device_get_base_vertex_index(const struct wined3d_device *devi
     return device->stateBlock->state.base_vertex_index;
 }
 
-HRESULT CDECL wined3d_device_set_viewport(struct wined3d_device *device, const struct wined3d_viewport *viewport)
+void CDECL wined3d_device_set_viewport(struct wined3d_device *device, const struct wined3d_viewport *viewport)
 {
     TRACE("device %p, viewport %p.\n", device, viewport);
     TRACE("x %u, y %u, w %u, h %u, min_z %.8e, max_z %.8e.\n",
@@ -2304,12 +2304,10 @@ HRESULT CDECL wined3d_device_set_viewport(struct wined3d_device *device, const s
     if (device->isRecordingState)
     {
         TRACE("Recording... not performing anything\n");
-        return WINED3D_OK;
+        return;
     }
 
     device_invalidate_state(device, STATE_VIEWPORT);
-
-    return WINED3D_OK;
 }
 
 HRESULT CDECL wined3d_device_get_viewport(const struct wined3d_device *device, struct wined3d_viewport *viewport)
diff --git a/include/wine/wined3d.h b/include/wine/wined3d.h
index afb007cf169..fa8b417aeb5 100644
--- a/include/wine/wined3d.h
+++ b/include/wine/wined3d.h
@@ -2239,7 +2239,7 @@ HRESULT __cdecl wined3d_device_set_transform(struct wined3d_device *device,
 HRESULT __cdecl wined3d_device_set_vertex_declaration(struct wined3d_device *device,
         struct wined3d_vertex_declaration *declaration);
 HRESULT __cdecl wined3d_device_set_vertex_shader(struct wined3d_device *device, struct wined3d_shader *shader);
-HRESULT __cdecl wined3d_device_set_viewport(struct wined3d_device *device, const struct wined3d_viewport *viewport);
+void __cdecl wined3d_device_set_viewport(struct wined3d_device *device, const struct wined3d_viewport *viewport);
 HRESULT __cdecl wined3d_device_set_vs_consts_b(struct wined3d_device *device,
         UINT start_register, const BOOL *constants, UINT bool_count);
 HRESULT __cdecl wined3d_device_set_vs_consts_f(struct wined3d_device *device,