diff --git a/simgear/structure/event_mgr.cxx b/simgear/structure/event_mgr.cxx
index c66f00ce..a62e83f9 100644
--- a/simgear/structure/event_mgr.cxx
+++ b/simgear/structure/event_mgr.cxx
@@ -35,9 +35,10 @@ void SGTimer::run()
 
 void SGEventMgr::update(double delta_time_sec)
 {
-    _rtQueue.update(delta_time_sec);
-    if(!_freezeProp || _freezeProp->getBoolValue() == false)
-        _simQueue.update(delta_time_sec);
+    _simQueue.update(delta_time_sec);
+    
+    double rt = _rtProp ? _rtProp->getDoubleValue() : 0;
+    _rtQueue.update(rt);
 }
 
 ////////////////////////////////////////////////////////////////////////
diff --git a/simgear/structure/event_mgr.hxx b/simgear/structure/event_mgr.hxx
index 4c89b060..66face68 100644
--- a/simgear/structure/event_mgr.hxx
+++ b/simgear/structure/event_mgr.hxx
@@ -62,13 +62,13 @@ private:
 class SGEventMgr : public SGSubsystem
 {
 public:
-    SGEventMgr() { _freezeProp = 0; }
-    ~SGEventMgr() { _freezeProp = 0; }
+    SGEventMgr() { _rtProp = 0; }
+    ~SGEventMgr() { _rtProp = 0; }
 
     virtual void init() {}
     virtual void update(double delta_time_sec);
 
-    void setFreezeProperty(SGPropertyNode* node) { _freezeProp = node; }
+    void setRealtimeProperty(SGPropertyNode* node) { _rtProp = node; }
 
     /**
      * Add a single function callback event as a repeating task.
@@ -116,6 +116,7 @@ private:
              bool repeat, bool simtime);
 
     SGPropertyNode* _freezeProp;
+    SGPropertyNode* _rtProp;
     SGTimerQueue _rtQueue; 
     SGTimerQueue _simQueue;
 };