diff --git a/src/Main/util.cxx b/src/Main/util.cxx
index 3eb68faa0..056b9c4ed 100644
--- a/src/Main/util.cxx
+++ b/src/Main/util.cxx
@@ -109,9 +109,16 @@ fgExit (int status)
 {
     // remove subsystems first, which need access to other subsystems in their
     // destructors (e.g. "nasal")
-    SGSubsystem *sub = globals->get_subsystem("ai_model");
+    SGSubsystem *sub;
+
+    sub = globals->get_subsystem("ai_model");
     globals->get_subsystem_mgr()->get_group(SGSubsystemMgr::GENERAL)->remove_subsystem("ai_model");
     delete sub;
+
+    sub = globals->get_subsystem("submodel_mgr");
+    globals->get_subsystem_mgr()->get_group(SGSubsystemMgr::GENERAL)->remove_subsystem("submodel_mgr");
+    delete sub;
+
 #ifdef OSG_LIBRARY_STATIC
     osgDB::Registry::instance( true);
 #endif