diff --git a/Util/GraphLoader.h b/Util/GraphLoader.h
index 75dbfad4b..099d390dd 100644
--- a/Util/GraphLoader.h
+++ b/Util/GraphLoader.h
@@ -364,7 +364,7 @@ template<typename NodeT, typename EdgeT>
 unsigned readHSGRFromStream(istream &in, vector<NodeT>& nodeList, vector<EdgeT> & edgeList) {
     unsigned numberOfNodes = 0;
     in.read((char*) & numberOfNodes, sizeof(unsigned));
-    nodeList.resize(numberOfNodes);
+    nodeList.resize(numberOfNodes + 1);
     NodeT currentNode;
     for(unsigned nodeCounter = 0; nodeCounter < numberOfNodes; ++nodeCounter ) {
         in.read((char*) &currentNode, sizeof(NodeT));