diff --git a/app/views/issues/_issues_calendar.ics.ruby b/app/views/issues/_issues_calendar.ics.ruby
index 73ab8489e0c..94c3099ace2 100644
--- a/app/views/issues/_issues_calendar.ics.ruby
+++ b/app/views/issues/_issues_calendar.ics.ruby
@@ -3,7 +3,7 @@ cal.prodid = '-//GitLab//NONSGML GitLab//EN'
 cal.x_wr_calname = 'GitLab Issues'
 
 # rubocop: disable CodeReuse/ActiveRecord
-@issues.includes(project: :namespace).each do |issue|
+@issues.preload(project: :namespace).each do |issue|
   cal.event do |event|
     event.dtstart     = Icalendar::Values::Date.new(issue.due_date)
     event.summary     = "#{issue.title} (in #{issue.project.full_path})"
diff --git a/changelogs/unreleased/54146-fix-calendar-query.yml b/changelogs/unreleased/54146-fix-calendar-query.yml
new file mode 100644
index 00000000000..dcac343108a
--- /dev/null
+++ b/changelogs/unreleased/54146-fix-calendar-query.yml
@@ -0,0 +1,5 @@
+---
+title: Fix project calendar feed when sorted by priority
+merge_request: 23870
+author:
+type: fixed
diff --git a/spec/features/ics/project_issues_spec.rb b/spec/features/ics/project_issues_spec.rb
index 2ca3d52a5be..54143595e6b 100644
--- a/spec/features/ics/project_issues_spec.rb
+++ b/spec/features/ics/project_issues_spec.rb
@@ -72,5 +72,14 @@ describe 'Project Issues Calendar Feed'  do
         expect(body).to have_text('TRANSP:TRANSPARENT')
       end
     end
+
+    context 'sorted by priority' do
+      it 'renders calendar feed' do
+        visit project_issues_path(project, :ics, sort: 'priority', feed_token: user.feed_token)
+
+        expect(response_headers['Content-Type']).to have_content('text/calendar')
+        expect(body).to have_text('BEGIN:VCALENDAR')
+      end
+    end
   end
 end