diff --git a/step/worldmodel.cc b/step/worldmodel.cc
--- a/step/worldmodel.cc
+++ b/step/worldmodel.cc
@@ -627,6 +627,8 @@
         foreach(StepCore::Item* it, items) deleteItem(it);
         endMacro();
     }
+
+    _updatingRecalcFn=false;
 }
 
 void WorldModel::addCreatedItem(StepCore::Item* item, StepCore::ItemGroup* parent)