diff --git a/acceptance/tests/ticket_12572_no_last_run_summary_diff.rb b/acceptance/tests/ticket_12572_no_last_run_summary_diff.rb
new file mode 100644
index 000000000..586168469
--- /dev/null
+++ b/acceptance/tests/ticket_12572_no_last_run_summary_diff.rb
@@ -0,0 +1,9 @@
+test_name "#12572: Don't print a diff for last_run_summary when show_diff is on"
+
+agents.each do |host|
+  # Have to run apply twice in order to make sure a diff would be relevant
+  on host, puppet_apply("--verbose --show_diff"), :stdin => "notice 'hello'"
+  on host, puppet_apply("--verbose --show_diff"), :stdin => "notice 'hello'" do
+    assert_no_match(/notice:.*last_run_summary/, stdout, "should not show a diff for last_run_summary")
+  end
+end