--- a/langtools/test/tools/lib/toolbox/ModuleBuilder.java	Tue Aug 30 17:47:46 2016 -0700
+++ b/langtools/test/tools/lib/toolbox/ModuleBuilder.java	Tue Aug 30 20:49:41 2016 -0700
@@ -205,7 +205,7 @@
                 .collect(Collectors.joining(File.pathSeparator));
         new JavacTask(tb)
                 .outdir(Files.createDirectories(modules.resolve(name)))
-                .options("-mp", mp)
+                .options("--module-path", mp)
                 .files(tb.findJavaFiles(moduleSrc))
                 .run()
                 .writeAll();