diff --git a/basictest/runner.rb b/basictest/runner.rb
old mode 100644
new mode 100755
index 2997f3af48..3a60036ffa
--- a/basictest/runner.rb
+++ b/basictest/runner.rb
@@ -17,7 +17,7 @@ $stderr.reopen($stdout)
 error = ''
 
 srcdir = File.expand_path('..', File.dirname(__FILE__))
-`#{ruby} #{opt} #{srcdir}/basictest/test.rb #{ARGV.join(' ')}`.each_line do |line|
+`#{ruby} #{opt} -W1 #{srcdir}/basictest/test.rb #{ARGV.join(' ')}`.each_line do |line|
   if line =~ /^end of test/
     print "\ntest succeeded\n"
     exit true