diff --git a/test/io/wait/test_io_wait.rb b/test/io/wait/test_io_wait.rb
index 5d0f0bfd34..9ef19b1bb3 100644
--- a/test/io/wait/test_io_wait.rb
+++ b/test/io/wait/test_io_wait.rb
@@ -165,12 +165,12 @@ class TestIOWait < Test::Unit::TestCase
     omit("Missing IO::WRITABLE!") unless IO.const_defined?(:WRITABLE)
     assert_equal IO::WRITABLE, @w.wait(IO::WRITABLE, 0)
   end
-  
+
   def test_wait_mask_readable
     omit("Missing IO::READABLE!") unless IO.const_defined?(:READABLE)
     @w.write("Hello World\n" * 3)
     assert_equal IO::READABLE, @r.wait(IO::READABLE, 0)
-    
+
     @r.gets
     assert_equal IO::READABLE, @r.wait(IO::READABLE, 0)
   end