diff --git a/dlls/d3drm/tests/d3drm.c b/dlls/d3drm/tests/d3drm.c
index 32938878dca..bb58350d5a1 100644
--- a/dlls/d3drm/tests/d3drm.c
+++ b/dlls/d3drm/tests/d3drm.c
@@ -2151,6 +2151,8 @@ static void test_Viewport(void)
     ok(hr == D3DRMERR_BADOBJECT, "Got unexpected hr %#x.\n", hr);
     hr = IDirect3DRMViewport_SetField(viewport, 0.5f);
     ok(hr == D3DRMERR_BADOBJECT, "Got unexpected hr %#x.\n", hr);
+    hr = IDirect3DRMViewport_SetPlane(viewport, -0.5f, 0.5f, -0.5f, 0.5f);
+    ok(hr == D3DRMERR_BADOBJECT, "Got unexpected hr %#x.\n", hr);
 
     /* Test all failures together */
     hr = IDirect3DRMViewport_Init(viewport, NULL, frame, rc.left, rc.top, rc.right, rc.bottom);
@@ -2234,6 +2236,17 @@ static void test_Viewport(void)
     ok(bottom == -1.0f, "Got unexpected bottom %.8e.\n", bottom);
     ok(top == 1.0f, "Got unexpected top %.8e.\n", top);
 
+    hr = IDirect3DRMViewport_SetPlane(viewport, 5.0f, 3.0f, 2.0f, 0.0f);
+    ok(hr == D3DRM_OK, "Got unexpected hr %#x.\n", hr);
+    field = IDirect3DRMViewport_GetField(viewport);
+    ok(field == -1.0f, "Got unexpected field %.8e.\n", field);
+    hr = IDirect3DRMViewport_GetPlane(viewport, &left, &right, &bottom, &top);
+    ok(hr == D3DRM_OK, "Got unexpected hr %#x.\n", hr);
+    ok(left == 5.0f, "Got unexpected left %.8e.\n", left);
+    ok(right == 3.0f, "Got unexpected right %.8e.\n", right);
+    ok(bottom == 2.0f, "Got unexpected bottom %.8e.\n", bottom);
+    ok(top == 0.0f, "Got unexpected top %.8e.\n", top);
+
     hr = IDirect3DRMViewport_Init(viewport, device1, frame, rc.left, rc.top, rc.right, rc.bottom);
     ok(hr == D3DRMERR_BADOBJECT, "Expected hr == D3DRMERR_BADOBJECT, got %#x.\n", hr);
     hr = IDirect3DRMViewport_GetDevice(viewport, NULL);
@@ -2292,6 +2305,8 @@ static void test_Viewport(void)
     ok(hr == D3DRMERR_BADOBJECT, "Got unexpected hr %#x.\n", hr);
     hr = IDirect3DRMViewport2_SetField(viewport2, 0.5f);
     ok(hr == D3DRMERR_BADOBJECT, "Got unexpected hr %#x.\n", hr);
+    hr = IDirect3DRMViewport2_SetPlane(viewport2, -0.5f, 0.5f, -0.5f, 0.5f);
+    ok(hr == D3DRMERR_BADOBJECT, "Got unexpected hr %#x.\n", hr);
 
     hr = IDirect3DRMViewport2_Init(viewport2, NULL, frame3, rc.left, rc.top, rc.right, rc.bottom);
     ok(hr == D3DRMERR_BADOBJECT, "Expected hr == D3DRMERR_BADOBJECT, got %#x.\n", hr);
@@ -2368,6 +2383,17 @@ static void test_Viewport(void)
     ok(bottom == -1.0f, "Got unexpected bottom %.8e.\n", bottom);
     ok(top == 1.0f, "Got unexpected top %.8e.\n", top);
 
+    hr = IDirect3DRMViewport2_SetPlane(viewport2, 5.0f, 3.0f, 2.0f, 0.0f);
+    ok(hr == D3DRM_OK, "Got unexpected hr %#x.\n", hr);
+    field = IDirect3DRMViewport2_GetField(viewport2);
+    ok(field == -1.0f, "Got unexpected field %.8e.\n", field);
+    hr = IDirect3DRMViewport2_GetPlane(viewport2, &left, &right, &bottom, &top);
+    ok(hr == D3DRM_OK, "Got unexpected hr %#x.\n", hr);
+    ok(left == 5.0f, "Got unexpected left %.8e.\n", left);
+    ok(right == 3.0f, "Got unexpected right %.8e.\n", right);
+    ok(bottom == 2.0f, "Got unexpected bottom %.8e.\n", bottom);
+    ok(top == 0.0f, "Got unexpected top %.8e.\n", top);
+
     hr = IDirect3DRMViewport2_Init(viewport2, device3, frame3, rc.left, rc.top, rc.right, rc.bottom);
     ok(hr == D3DRMERR_BADOBJECT, "Expected hr == D3DRMERR_BADOBJECT, got %#x.\n", hr);
     hr = IDirect3DRMViewport2_GetDevice(viewport2, NULL);
diff --git a/dlls/d3drm/viewport.c b/dlls/d3drm/viewport.c
index 97105994957..2c923b14c51 100644
--- a/dlls/d3drm/viewport.c
+++ b/dlls/d3drm/viewport.c
@@ -676,19 +676,31 @@ static HRESULT WINAPI d3drm_viewport1_ForceUpdate(IDirect3DRMViewport *iface,
 static HRESULT WINAPI d3drm_viewport2_SetPlane(IDirect3DRMViewport2 *iface,
         D3DVALUE left, D3DVALUE right, D3DVALUE bottom, D3DVALUE top)
 {
-    FIXME("iface %p, left %.8e, right %.8e, bottom %.8e, top %.8e stub!\n",
+    struct d3drm_viewport *viewport = impl_from_IDirect3DRMViewport2(iface);
+
+    TRACE("iface %p, left %.8e, right %.8e, bottom %.8e, top %.8e.\n",
             iface, left, right, bottom, top);
 
-    return E_NOTIMPL;
+    if (!viewport->d3d_viewport)
+        return D3DRMERR_BADOBJECT;
+
+    viewport->clip.left = left;
+    viewport->clip.right = right;
+    viewport->clip.bottom = bottom;
+    viewport->clip.top = top;
+
+    return D3DRM_OK;
 }
 
 static HRESULT WINAPI d3drm_viewport1_SetPlane(IDirect3DRMViewport *iface,
         D3DVALUE left, D3DVALUE right, D3DVALUE bottom, D3DVALUE top)
 {
-    FIXME("iface %p, left %.8e, right %.8e, bottom %.8e, top %.8e stub!\n",
+    struct d3drm_viewport *viewport = impl_from_IDirect3DRMViewport(iface);
+
+    TRACE("iface %p, left %.8e, right %.8e, bottom %.8e, top %.8e.\n",
             iface, left, right, bottom, top);
 
-    return E_NOTIMPL;
+    return d3drm_viewport2_SetPlane(&viewport->IDirect3DRMViewport2_iface, left, right, bottom, top);
 }
 
 static HRESULT WINAPI d3drm_viewport2_GetCamera(IDirect3DRMViewport2 *iface, IDirect3DRMFrame3 **camera)