diff --git a/test/io/wait/test_io_wait_uncommon.rb b/test/io/wait/test_io_wait_uncommon.rb
index d76be914a5..e7f222c578 100644
--- a/test/io/wait/test_io_wait_uncommon.rb
+++ b/test/io/wait/test_io_wait_uncommon.rb
@@ -59,7 +59,13 @@ class TestIOWaitUncommon < Test::Unit::TestCase
   end
 
   def test_wait_readable_random
-    check_dev 'random'
+    File.open('/dev/random') do |fp|
+      assert_nothing_raised do
+        fp.wait_readable(0)
+      end
+    end
+  rescue SystemCallError => e
+    skip "/dev/random could not be opened #{e.message} (#{e.class})"
   end
 
   def test_wait_readable_zero