diff --git a/lib/gitlab/ci/pipeline_duration.rb b/lib/gitlab/ci/pipeline_duration.rb
index d8fb05724bc..55d870e2e9d 100644
--- a/lib/gitlab/ci/pipeline_duration.rb
+++ b/lib/gitlab/ci/pipeline_duration.rb
@@ -2,7 +2,7 @@ module Gitlab
   module Ci
     class PipelineDuration
       PeriodStruct = Struct.new(:first, :last)
-      class Period < SegmentStruct
+      class Period < PeriodStruct
         def duration
           last - first
         end