diff --git a/actionpack/lib/action_dispatch/system_testing/test_helpers/screenshot_helper.rb b/actionpack/lib/action_dispatch/system_testing/test_helpers/screenshot_helper.rb
index 79359a0c8b..056ce51a61 100644
--- a/actionpack/lib/action_dispatch/system_testing/test_helpers/screenshot_helper.rb
+++ b/actionpack/lib/action_dispatch/system_testing/test_helpers/screenshot_helper.rb
@@ -39,7 +39,8 @@ module ActionDispatch
 
         private
           def image_name
-            failed? ? "failures_#{method_name}" : method_name
+            name = method_name[0...225]
+            failed? ? "failures_#{name}" : name
           end
 
           def image_path
diff --git a/actionpack/test/dispatch/system_testing/screenshot_helper_test.rb b/actionpack/test/dispatch/system_testing/screenshot_helper_test.rb
index b756b91379..b0b36f9d74 100644
--- a/actionpack/test/dispatch/system_testing/screenshot_helper_test.rb
+++ b/actionpack/test/dispatch/system_testing/screenshot_helper_test.rb
@@ -36,6 +36,14 @@ class ScreenshotHelperTest < ActiveSupport::TestCase
     end
   end
 
+  test "image name truncates names over 225 characters" do
+    new_test = DrivenBySeleniumWithChrome.new("x" * 400)
+
+    Rails.stub :root, Pathname.getwd do
+      assert_equal Rails.root.join("tmp/screenshots/#{"x" * 225}.png").to_s, new_test.send(:image_path)
+    end
+  end
+
   test "defaults to simple output for the screenshot" do
     new_test = DrivenBySeleniumWithChrome.new("x")
     assert_equal "simple", new_test.send(:output_type)