diff --git a/simgear/props/PropertyBasedMgr.cxx b/simgear/props/PropertyBasedMgr.cxx
index 621d11db..4091da9f 100644
--- a/simgear/props/PropertyBasedMgr.cxx
+++ b/simgear/props/PropertyBasedMgr.cxx
@@ -37,6 +37,7 @@ namespace simgear
   void PropertyBasedMgr::shutdown()
   {
     _props->removeChangeListener(this);
+    _elements.clear();
   }
 
   //----------------------------------------------------------------------------