diff --git a/dlls/d3d8/buffer.c b/dlls/d3d8/buffer.c
index 7d0421d1621..24045068705 100644
--- a/dlls/d3d8/buffer.c
+++ b/dlls/d3d8/buffer.c
@@ -465,14 +465,20 @@ static HRESULT WINAPI d3d8_indexbuffer_Lock(IDirect3DIndexBuffer8 *iface, UINT o
         BYTE **data, DWORD flags)
 {
     struct d3d8_indexbuffer *buffer = impl_from_IDirect3DIndexBuffer8(iface);
+    struct wined3d_map_desc wined3d_map_desc;
+    struct wined3d_box wined3d_box = {0};
     HRESULT hr;
 
     TRACE("iface %p, offset %u, size %u, data %p, flags %#x.\n",
             iface, offset, size, data, flags);
 
+    wined3d_box.left = offset;
+    wined3d_box.right = offset + size;
     wined3d_mutex_lock();
-    hr = wined3d_buffer_map(buffer->wined3d_buffer, offset, size, data, flags);
+    hr = wined3d_resource_map(wined3d_buffer_get_resource(buffer->wined3d_buffer),
+            0, &wined3d_map_desc, &wined3d_box, flags);
     wined3d_mutex_unlock();
+    *data = wined3d_map_desc.data;
 
     return hr;
 }