diff --git a/src/Scripting/NasalSys.cxx b/src/Scripting/NasalSys.cxx
index 68119ed28..d360d211f 100644
--- a/src/Scripting/NasalSys.cxx
+++ b/src/Scripting/NasalSys.cxx
@@ -433,14 +433,14 @@ void FGNasalSys::update(double)
 {
     if(_purgeListeners) {
         _purgeListeners = false;
-        map<int, FGNasalListener *>::reverse_iterator it, eit;
-        map<int, FGNasalListener *>::reverse_iterator end = _listener.rend();
-        for(it = _listener.rbegin(); it != end; ) {
-            eit = it++;
-            FGNasalListener *nl = eit->second;
+        map<int, FGNasalListener *>::iterator it;
+        for ( it = _listener.begin(); it != _listener.end(); ) {
+            FGNasalListener *nl = it->second;
             if(nl->_dead) {
-                _listener.erase((++eit).base());
+                _listener.erase( it++ );
                 delete nl;
+            } else {
+                ++it;
             }
         }
     }