diff --git a/app/jobs/stat_collection_job.rb b/app/jobs/stat_collection_job.rb
index 16f04738..e70544c3 100644
--- a/app/jobs/stat_collection_job.rb
+++ b/app/jobs/stat_collection_job.rb
@@ -44,7 +44,7 @@ class StatCollectionJob < PeriodicJob
           .where_dimensions(site_id: site.id)
           .group("dimensions->'site_id'")
           .rollup(name, interval: interval, update: true) do |rollup|
-            rollup.try(:operation, :value)
+            rollup.try(operation, :value)
           end
   end