diff --git a/lib/pact_broker/db/clean/selector.rb b/lib/pact_broker/db/clean/selector.rb
index a011a3f0f..0be400a3a 100644
--- a/lib/pact_broker/db/clean/selector.rb
+++ b/lib/pact_broker/db/clean/selector.rb
@@ -33,7 +33,7 @@ def to_hash
         end
         alias_method :to_h, :to_hash
 
-        def to_json
+        def to_json(opts = nil)
           (@source_hash || to_hash).to_json
         end
 
diff --git a/lib/pact_broker/tasks/clean_task.rb b/lib/pact_broker/tasks/clean_task.rb
index 231ef4927..f70e3edc0 100644
--- a/lib/pact_broker/tasks/clean_task.rb
+++ b/lib/pact_broker/tasks/clean_task.rb
@@ -17,9 +17,9 @@ def initialize &block
       end
 
       def keep_version_selectors=(keep_version_selectors)
-        require "pact_broker/matrix/unresolved_selector"
+        require "pact_broker/db/clean/selector"
         @keep_version_selectors = [*keep_version_selectors].collect do | hash |
-          PactBroker::Matrix::UnresolvedSelector.from_hash(hash)
+          PactBroker::DB::Clean::Selector.from_hash(hash)
         end
       end