diff --git a/app/services/post_status_service.rb b/app/services/post_status_service.rb
index bd3b696329..7b57c05f58 100644
--- a/app/services/post_status_service.rb
+++ b/app/services/post_status_service.rb
@@ -137,7 +137,7 @@ class PostStatusService < BaseService
 
   def idempotency_duplicate
     if scheduled?
-      @account.schedule_statuses.find(@idempotency_duplicate)
+      @account.scheduled_statuses.find(@idempotency_duplicate)
     else
       @account.statuses.find(@idempotency_duplicate)
     end
@@ -189,7 +189,7 @@ class PostStatusService < BaseService
   end
 
   def scheduled_options
-    @options.tap do |options_hash|
+    @options.dup.tap do |options_hash|
       options_hash[:in_reply_to_id]  = options_hash.delete(:thread)&.id
       options_hash[:application_id]  = options_hash.delete(:application)&.id
       options_hash[:scheduled_at]    = nil
diff --git a/spec/services/post_status_service_spec.rb b/spec/services/post_status_service_spec.rb
index d21270c793..c56f9efdb0 100644
--- a/spec/services/post_status_service_spec.rb
+++ b/spec/services/post_status_service_spec.rb
@@ -52,6 +52,13 @@ RSpec.describe PostStatusService, type: :service do
     it 'does not change statuses count' do
       expect { subject.call(account, text: 'Hi future!', scheduled_at: future, thread: previous_status) }.not_to change { [account.statuses_count, previous_status.replies_count] }
     end
+
+    it 'returns existing status when used twice with idempotency key' do
+      account = Fabricate(:account)
+      status1 = subject.call(account, text: 'test', idempotency: 'meepmeep', scheduled_at: future)
+      status2 = subject.call(account, text: 'test', idempotency: 'meepmeep', scheduled_at: future)
+      expect(status2.id).to eq status1.id
+    end
   end
 
   it 'creates response to the original status of boost' do