diff --git a/Engine.cc b/Engine.cc
index 400c66b..f049ee0 100644
--- a/Engine.cc
+++ b/Engine.cc
@@ -1369,6 +1369,7 @@ int Engine::Quad::render()
     if (do_offset)
     {
         glEnable(GL_POLYGON_OFFSET_FILL);
+        glPolygonOffset(0.0, -1.0f * m_offset);
     }
     if (m_texture != 0)
     {