diff --git a/dlls/d3d8/device.c b/dlls/d3d8/device.c
index fc1d220847e..33ff7a548e5 100644
--- a/dlls/d3d8/device.c
+++ b/dlls/d3d8/device.c
@@ -2122,11 +2122,12 @@ static HRESULT WINAPI d3d8_device_DrawIndexedPrimitiveUP(IDirect3DDevice8 *iface
 {
     struct d3d8_device *device = impl_from_IDirect3DDevice8(iface);
     HRESULT hr;
-    BYTE *buffer_data;
-
     UINT idx_count = vertex_count_from_primitive_count(primitive_type, primitive_count);
     UINT idx_fmt_size = index_format == D3DFMT_INDEX16 ? 2 : 4;
     UINT idx_size = idx_count * idx_fmt_size;
+    struct wined3d_map_desc wined3d_map_desc;
+    struct wined3d_box wined3d_box = {0};
+    struct wined3d_resource *ib, *vb;
     UINT ib_pos;
 
     UINT vtx_size = vertex_count * vertex_stride;
@@ -2157,12 +2158,14 @@ static HRESULT WINAPI d3d8_device_DrawIndexedPrimitiveUP(IDirect3DDevice8 *iface
     else
         vb_pos += align;
 
-    hr = wined3d_buffer_map(device->vertex_buffer, vb_pos, vtx_size, &buffer_data,
-            vb_pos ? WINED3D_MAP_NOOVERWRITE : WINED3D_MAP_DISCARD);
-    if (FAILED(hr))
+    wined3d_box.left = vb_pos;
+    wined3d_box.right = vb_pos + vtx_size;
+    vb = wined3d_buffer_get_resource(device->vertex_buffer);
+    if (FAILED(hr = wined3d_resource_map(vb, 0, &wined3d_map_desc, &wined3d_box,
+            vb_pos ? WINED3D_MAP_NOOVERWRITE : WINED3D_MAP_DISCARD)))
         goto done;
-    memcpy(buffer_data, vertex_data, vtx_size);
-    wined3d_buffer_unmap(device->vertex_buffer);
+    memcpy(wined3d_map_desc.data, vertex_data, vtx_size);
+    wined3d_resource_unmap(vb, 0);
     device->vertex_buffer_pos = vb_pos + vtx_size;
 
     hr = d3d8_device_prepare_index_buffer(device, idx_size);
@@ -2177,12 +2180,14 @@ static HRESULT WINAPI d3d8_device_DrawIndexedPrimitiveUP(IDirect3DDevice8 *iface
     else
         ib_pos += align;
 
-    hr = wined3d_buffer_map(device->index_buffer, ib_pos, idx_size, &buffer_data,
-            ib_pos ? WINED3D_MAP_NOOVERWRITE : WINED3D_MAP_DISCARD);
-    if (FAILED(hr))
+    wined3d_box.left = ib_pos;
+    wined3d_box.right = ib_pos + idx_size;
+    ib = wined3d_buffer_get_resource(device->index_buffer);
+    if (FAILED(hr = wined3d_resource_map(ib, 0, &wined3d_map_desc, &wined3d_box,
+            ib_pos ? WINED3D_MAP_NOOVERWRITE : WINED3D_MAP_DISCARD)))
         goto done;
-    memcpy(buffer_data, index_data, idx_size);
-    wined3d_buffer_unmap(device->index_buffer);
+    memcpy(wined3d_map_desc.data, index_data, idx_size);
+    wined3d_resource_unmap(ib, 0);
     device->index_buffer_pos = ib_pos + idx_size;
 
     hr = wined3d_device_set_stream_source(device->wined3d_device, 0, device->vertex_buffer, 0, vertex_stride);