diff --git a/sample_scripts/globular_protein.py b/sample_scripts/globular_protein.py
index 5193a99..4fe0025 100644
--- a/sample_scripts/globular_protein.py
+++ b/sample_scripts/globular_protein.py
@@ -70,7 +70,9 @@
 
 #Reads the VTF file of the protein model
 
-topology_dict = pmb.read_cg_protein_model (filename=protein_filename)
+path_to_cg=pmb.get_resource(args.path_to_cg)
+
+topology_dict = pmb.read_cg_protein_model (filename=path_to_cg)
 
 path_to_cg=pmb.get_resource(args.path_to_cg)