diff --git a/src/ATCDCL/ATCmgr.cxx b/src/ATCDCL/ATCmgr.cxx
index bbb7d3c50..69a0b1179 100644
--- a/src/ATCDCL/ATCmgr.cxx
+++ b/src/ATCDCL/ATCmgr.cxx
@@ -52,6 +52,7 @@ FGATCMgr::FGATCMgr() :
 }
 
 FGATCMgr::~FGATCMgr() {
+    globals->set_ATC_mgr(NULL);
     delete v1;
 }