diff --git a/Utilities/for_trees/ContaminationBySisters_v2.1.py b/Utilities/for_trees/ContaminationBySisters_v2.1.py
index 7eebf42..bde3446 100644
--- a/Utilities/for_trees/ContaminationBySisters_v2.1.py
+++ b/Utilities/for_trees/ContaminationBySisters_v2.1.py
@@ -122,7 +122,7 @@ def write_all_data(args):
 					consider = True
 				else:
 					for clade in args.query_clades:
-						if leaf.startswith(clade):
+						if leaf.name.startswith(clade):
 							consider = True
 							break
 
@@ -277,4 +277,4 @@ main()
 
 
 
-			
\ No newline at end of file
+