diff --git a/plugins/org.eclipse.dltk.ruby.testing/testing/dltk-testunit-runner.rb b/plugins/org.eclipse.dltk.ruby.testing/testing/dltk-testunit-runner.rb
index ce6363a..c229c55 100644
--- a/plugins/org.eclipse.dltk.ruby.testing/testing/dltk-testunit-runner.rb
+++ b/plugins/org.eclipse.dltk.ruby.testing/testing/dltk-testunit-runner.rb
@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2008 xored software, Inc. and others
+# Copyright (c) 2008, 2016 xored software, Inc. and others
 # All rights reserved. This program and the accompanying materials
 # are made available under the terms of the Eclipse Public License v1.0
 # which accompanies this distribution, and is available at
@@ -8,7 +8,7 @@
 # Contributors:
 #    xored software, Inc. - initial API and Implementation (Alex Panchenko)
 #
-
+require 'test/unit'
 require 'test/unit/ui/console/testrunner'
 require 'socket'