diff --git a/model/annotated-topology-reader.cc b/model/annotated-topology-reader.cc
index db8392d..345c2f5 100644
--- a/model/annotated-topology-reader.cc
+++ b/model/annotated-topology-reader.cc
@@ -112,7 +112,7 @@
   return m_nodes;
 }
 
-std::list<TopologyReader::Link>
+const std::list<TopologyReader::Link>&
 AnnotatedTopologyReader::GetLinks () const
 {
   return m_linksList;