diff --git a/dlls/ddraw/vertexbuffer.c b/dlls/ddraw/vertexbuffer.c
index a0cc3f6cbe0..797afe2426d 100644
--- a/dlls/ddraw/vertexbuffer.c
+++ b/dlls/ddraw/vertexbuffer.c
@@ -309,7 +309,7 @@ static HRESULT WINAPI d3d_vertex_buffer7_Unlock(IDirect3DVertexBuffer7 *iface)
     TRACE("iface %p.\n", iface);
 
     wined3d_mutex_lock();
-    wined3d_buffer_unmap(buffer->wined3d_buffer);
+    wined3d_resource_unmap(wined3d_buffer_get_resource(buffer->wined3d_buffer), 0);
     wined3d_mutex_unlock();
 
     return D3D_OK;