diff --git a/main/Scene-load.cc b/main/Scene-load.cc
index b712e1b..dd5228b 100644
--- a/main/Scene-load.cc
+++ b/main/Scene-load.cc
@@ -281,6 +281,10 @@ vector<ShapeRef> Scene::processGeneralItems(refptr<Node> node)
         {
             incoming = processForNode(*it);
         }
+        else if ( (*it)->isExpression() )
+        {
+            (*it)->getNumber();     /* evaluate the expression */
+        }
         while (incoming.size() > 0)
         {
             shapes.push_back(incoming[0]);