diff --git a/src/netanim/model/animation-interface.cc b/src/netanim/model/animation-interface.cc
index ca7bde8ee..8b055283f 100644
--- a/src/netanim/model/animation-interface.cc
+++ b/src/netanim/model/animation-interface.cc
@@ -1616,7 +1616,7 @@ AnimationInterface::WriteNodes ()
       Ptr<Node> n = *i;
       NS_LOG_INFO ("Update Position for Node: " << n->GetId ());
       Vector v = UpdatePosition (n);
-      WriteXmlNode (n->GetId (), v.x, v.y);
+      WriteXmlNode (n->GetId (), n->GetSystemId (), v.x, v.y);
     }
 }
 
@@ -2072,10 +2072,11 @@ AnimationInterface::WriteXmlClose (std::string name, bool routing)
 }
 
 void 
-AnimationInterface::WriteXmlNode (uint32_t id, double locX, double locY)
+AnimationInterface::WriteXmlNode (uint32_t id, uint32_t sysId, double locX, double locY)
 {
   AnimXmlElement element ("node");
   element.AddAttribute ("id", id);
+  element.AddAttribute ("sysId", sysId);
   element.AddAttribute ("locX", locX);
   element.AddAttribute ("locY", locY);
   element.Close ();
diff --git a/src/netanim/model/animation-interface.h b/src/netanim/model/animation-interface.h
index cdb8a04fd..0e844091b 100644
--- a/src/netanim/model/animation-interface.h
+++ b/src/netanim/model/animation-interface.h
@@ -780,7 +780,7 @@ private:
   void WriteXmlAddNodeCounter (uint32_t counterId, std::string counterName, CounterType counterType);
   void WriteXmlUpdateNodeImage (uint32_t nodeId, uint32_t resourceId);
   void WriteXmlUpdateNodeCounter (uint32_t counterId, uint32_t nodeId, double value);
-  void WriteXmlNode (uint32_t id, double locX, double locY);
+  void WriteXmlNode (uint32_t id, uint32_t sysId, double locX, double locY);
   void WriteXmlLink (uint32_t fromId, uint32_t toLp, uint32_t toId);
   void WriteXmlUpdateLink (uint32_t fromId, uint32_t toId, std::string);
   void WriteXmlP (std::string pktType,