diff --git a/app/models/ci/pipeline.rb b/app/models/ci/pipeline.rb
index 581acdf8e51..a57ae0085ca 100644
--- a/app/models/ci/pipeline.rb
+++ b/app/models/ci/pipeline.rb
@@ -79,7 +79,7 @@ module Ci
     end
 
     def self.duration
-      where.not(duration: nil).pluck(:duration).inject(0, &:+)
+      where.not(duration: nil).sum(:duration)
     end
 
     def project_id