diff --git a/lib/splitclient-rb/cache/repositories/rule_based_segments_repository.rb b/lib/splitclient-rb/cache/repositories/rule_based_segments_repository.rb
index 79264b8f..7f45e343 100644
--- a/lib/splitclient-rb/cache/repositories/rule_based_segments_repository.rb
+++ b/lib/splitclient-rb/cache/repositories/rule_based_segments_repository.rb
@@ -85,7 +85,8 @@ def clear
 
         def contains?(segment_names)
           return false if rule_based_segment_names.empty?
-          return set(segment_names).subset?(rule_based_segment_names)
+
+          return segment_names.to_set.subset?(rule_based_segment_names.to_set)
         end
 
         private
diff --git a/spec/cache/repositories/rule_based_segments_repository_spec.rb b/spec/cache/repositories/rule_based_segments_repository_spec.rb
index a4e2b9ba..3fdd89ed 100644
--- a/spec/cache/repositories/rule_based_segments_repository_spec.rb
+++ b/spec/cache/repositories/rule_based_segments_repository_spec.rb
@@ -40,6 +40,11 @@
       )
     end
 
+    it 'contains' do
+      expect(repository.contains?(['foo', 'bar'].to_set)).to eq(true)
+      expect(repository.contains?(['foo', 'oof'].to_set)).to eq(false)
+    end
+
     it 'remove undefined matcher with template condition' do
       rule_based_segment = { name: 'corge', trafficTypeName: 'tt_name_5', conditions: [
         {