diff --git a/src/Environment/environment_mgr.cxx b/src/Environment/environment_mgr.cxx
index e7688d793..b4e62bc15 100644
--- a/src/Environment/environment_mgr.cxx
+++ b/src/Environment/environment_mgr.cxx
@@ -158,6 +158,7 @@ void
 FGEnvironmentMgr::shutdown()
 {
   globals->get_event_mgr()->removeTask("updateClosestAirport");
+  SGSubsystemGroup::shutdown();
 }
 
 void