diff --git a/actionmailer/test/base_test.rb b/actionmailer/test/base_test.rb
index 02707d0b5f..d4a89a17ee 100644
--- a/actionmailer/test/base_test.rb
+++ b/actionmailer/test/base_test.rb
@@ -13,6 +13,7 @@ class BaseTest < ActiveSupport::TestCase
   def teardown
     ActionMailer::Base.asset_host = nil
     ActionMailer::Base.assets_dir = nil
+    ActionMailer::Base.preview_interceptors.clear
   end
 
   test "method call to mail does not raise error" do