diff --git a/bootstraptest/test_knownbug.rb b/bootstraptest/test_knownbug.rb
index b97a08d928..27fe02a66e 100644
--- a/bootstraptest/test_knownbug.rb
+++ b/bootstraptest/test_knownbug.rb
@@ -3,3 +3,9 @@
 # So all tests will cause failure.
 #
 
+assert_equal '0', %q{
+  GC.stress = true
+  pid = fork {}
+  Process.wait pid
+  $?.to_i
+}, '[ruby-dev:32404]'