diff --git a/.rubocop.yml b/.rubocop.yml
index 7863dd09c..90759c3ac 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -460,6 +460,9 @@ Rails/SaveBang:
   Enabled: true
   Severity: refactor
 
+Rails/SelectMap:
+  Enabled: true
+
 Rails/SkipsModelValidations:
   Enabled: true
   ForbiddenMethods:
diff --git a/app/controllers/admin/poll/officer_assignments_controller.rb b/app/controllers/admin/poll/officer_assignments_controller.rb
index 82e45a182..71432bb2a 100644
--- a/app/controllers/admin/poll/officer_assignments_controller.rb
+++ b/app/controllers/admin/poll/officer_assignments_controller.rb
@@ -7,7 +7,7 @@ class Admin::Poll::OfficerAssignmentsController < Admin::Poll::BaseController
     @officers = ::Poll::Officer
                 .includes(:user)
                 .order("users.username")
-                .where(id: @poll.officer_assignments.select(:officer_id).distinct.map(&:officer_id))
+                .where(id: @poll.officer_assignments.distinct.pluck(:officer_id))
                 .page(params[:page])
                 .per(50)
   end