diff --git a/sequencer/NetworkPlan.py b/sequencer/NetworkPlan.py
index 275a424..36f8d9e 100644
--- a/sequencer/NetworkPlan.py
+++ b/sequencer/NetworkPlan.py
@@ -45,7 +45,7 @@ def __init__(self, shp, csv, **kwargs):
                                                   loc_tol = self.TOL
                                                 )
 
-        self.coord_values = self.coords.values()
+        self.coord_values = np.array(self.coords.values())
 
         # Set the edge weight to the distance between those nodes
         self._weight_edges()