diff --git a/minindn/helpers/ndn_routing_helper.py b/minindn/helpers/ndn_routing_helper.py
index 38d841a..0fb4b33 100644
--- a/minindn/helpers/ndn_routing_helper.py
+++ b/minindn/helpers/ndn_routing_helper.py
@@ -305,7 +305,9 @@
         :param Nodes nodes: List of nodes from net object
         """
         for node in nodes:
-            self.namePrefixes[node.name] = prefix
+            if not node.name in self.namePrefixes:
+                self.namePrefixes[node.name] = []
+            self.namePrefixes[node.name] += prefix
 
     def calculateNPossibleRoutes(self, nFaces=0):
         """