diff --git a/app/services/qa/linked_data/graph_service.rb b/app/services/qa/linked_data/graph_service.rb
index 98ccee32..e29dfc0a 100644
--- a/app/services/qa/linked_data/graph_service.rb
+++ b/app/services/qa/linked_data/graph_service.rb
@@ -57,7 +57,7 @@ def subjects_for_object_value(graph:, predicate:, object_value:)
         def deep_copy(graph:)
           new_graph = RDF::Graph.new
           graph.statements.each do |st|
-            new_graph.insert(st.dup)
+            new_graph << st.dup
           end
           new_graph
         end