diff --git a/src/plugins/roadgraph/utils.cpp b/src/plugins/roadgraph/utils.cpp
index 48bb2d8..751d943 100644
--- a/src/plugins/roadgraph/utils.cpp
+++ b/src/plugins/roadgraph/utils.cpp
@@ -150,6 +150,7 @@ AdjacencyMatrix DijkstraFinder::find( const QgsPoint& frontPoint, const QgsPoint
   }
 
   AdjacencyMatrix m;
+  m[ frontPoint ];
   QgsPoint nextPoint = backPoint;
   QgsPoint firstPoint = backPoint;
   while ( true )