diff --git a/graph.cpp b/graph.cpp
index 47c23e3..3fcfa02 100644
--- a/graph.cpp
+++ b/graph.cpp
@@ -70,7 +70,7 @@ bool Graph::crosses_edge(Vertex* a, Vertex* b)
 	for (list<Vertex*>::iterator subcursor = v->neighbors.begin();
 	     subcursor != v->neighbors.end(); subcursor++)
 	{
-	    Vertex* w = *cursor;
+	    Vertex* w = *subcursor;
 
 	    if (MathUtils::lines_intersect(a->x, a->y, b->x, b->y,
 					   v->x, v->y, w->x, w->y))