diff --git a/setup.cfg b/setup.cfg
index 4087eb086..8bee69190 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -199,6 +199,7 @@ ceilometer.transformer =
     unit_conversion = ceilometer.transformer.conversions:ScalingTransformer
     rate_of_change = ceilometer.transformer.conversions:RateOfChangeTransformer
     aggregator = ceilometer.transformer.conversions:AggregatorTransformer
+    arithmetic = ceilometer.transformer.arithmetic:ArithmeticTransformer
 
 ceilometer.publisher =
     test = ceilometer.publisher.test:TestPublisher