diff --git a/lib/rubocop/ast/node_pattern/compiler/atom_subcompiler.rb b/lib/rubocop/ast/node_pattern/compiler/atom_subcompiler.rb
index e8221e912..20342e661 100644
--- a/lib/rubocop/ast/node_pattern/compiler/atom_subcompiler.rb
+++ b/lib/rubocop/ast/node_pattern/compiler/atom_subcompiler.rb
@@ -38,7 +38,7 @@ def visit_positional_parameter
           end
 
           def visit_set
-            set = node.children.map(&:child).to_set.freeze
+            set = node.children.to_set(&:child).freeze
             NodePattern::Sets[set]
           end