diff --git a/test/io/nonblock/test_flush.rb b/test/io/nonblock/test_flush.rb
index b031c71bf8..8c93c814a3 100644
--- a/test/io/nonblock/test_flush.rb
+++ b/test/io/nonblock/test_flush.rb
@@ -7,9 +7,14 @@ end
 
 class TestIONonblock < Test::Unit::TestCase
   def test_flush
-    flush_test(*IO.pipe) or
-      (require 'socket'; flush_test(*Socket.pair(:INET, :STREAM))) or
-      skip "nonblocking IO did not work"
+    IO.pipe {|r, w|
+      return if flush_test(r, w)
+    }
+    require 'socket';
+    Socket.pair(:INET, :STREAM) {|s1, s2|
+      return if flush_test(s1, s2)
+    }
+    skip "nonblocking IO did not work"
   end
 
   def flush_test(r, w)