diff --git a/src/mem/ruby/network/Topology.cc b/src/mem/ruby/network/Topology.cc
index f7afffd..6da251e 100644
--- a/src/mem/ruby/network/Topology.cc
+++ b/src/mem/ruby/network/Topology.cc
@@ -51,7 +51,8 @@
 Topology::Topology(uint32_t num_routers,
                    const vector<BasicExtLink *> &ext_links,
                    const vector<BasicIntLink *> &int_links)
-    : m_nodes(ext_links.size()), m_number_of_switches(num_routers),
+    : m_nodes(MachineType_base_number(MachineType_NUM)),
+      m_number_of_switches(num_routers),
       m_ext_link_vector(ext_links), m_int_link_vector(int_links)
 {
     // Total nodes/controllers in network