diff --git a/bootstraptest/test_thread.rb b/bootstraptest/test_thread.rb
index e463626167..5fd1d18e96 100644
--- a/bootstraptest/test_thread.rb
+++ b/bootstraptest/test_thread.rb
@@ -420,10 +420,13 @@ assert_finish 3, %q{
     end
   end
 
-  pid = fork do
-    # Child
-    STDOUT.write "This is the child process.\n"
-    STDOUT.write "Child process exiting.\n"
+  begin
+    pid = fork do
+      # Child
+      STDOUT.write "This is the child process.\n"
+      STDOUT.write "Child process exiting.\n"
+    end
+    Process.waitpid(pid)
+  rescue NotImplementedError
   end
-  Process.waitpid(pid)
 }, '[ruby-core:26361]'