diff --git a/gt_matlab_trajs.py b/gt_matlab_trajs.py
index ce11b524f8cede814572fa2540ca65e1576f3438..24dbc9718264a654256f3071b874f5374d3fb177 100755
--- a/gt_matlab_trajs.py
+++ b/gt_matlab_trajs.py
@@ -66,6 +66,9 @@ for node in g.vertices():
     else:
         trajectories[g.vp.traj[node]].append(g.vp.name[node])
 
+with open("trajectories.json", "w") as outfile:
+    json.dump(trajectories, outfile, indent = 4)
+
 # Setup a new trajectory that holds the expanded segments:
 
 expanded_trajectories = {}
@@ -88,7 +91,7 @@ for trajectory in trajectories.values():
             else:
                 expanded_trajectories[key].append(s)
 
-with open("trajectories.json", "w") as outfile:
+with open("expanded_trajectories.json", "w") as outfile:
     json.dump(expanded_trajectories, outfile, indent = 4)
 
 print(f'Done saving json: {len(trajectories)} trajectories.')