diff --git a/analyse_properties/main.py b/analyse_properties/main.py
index f3c27f9..ac1c899 100644
--- a/analyse_properties/main.py
+++ b/analyse_properties/main.py
@@ -91,7 +91,7 @@ class DeduplicateByID(beam.DoFn):
 
     def process(self, element):
         if len(list(element[1])) > 0:
-            deduplicated_element = list(list(element[0]), list([element[1][0]]))
+            deduplicated_element = (list(element[0]), [list(element[1])[0]])
             yield deduplicated_element
         else:
             yield element