diff --git a/ChangeLog b/ChangeLog
index 0b3d07e267..9ea28c87b8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+Mon Mar  5 16:50:22 2012  NAKAMURA Usaku  <usa@ruby-lang.org>
+
+	* test/ruby/test_sleep.rb (TestSleep#test_sleep_5sec): syntax error.
+
+	* test/ruby/test_sleep.rb (TestSleep#test_sleep_5sec): call uname
+	  only on linux because it's a workaround for linux only.
+
 Mon Mar  5 12:44:12 2012  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* st.c (unpack_entries): chain entries directly.  based on a patch
diff --git a/test/ruby/test_sleep.rb b/test/ruby/test_sleep.rb
index a4a24ee860..61004d3b5f 100644
--- a/test/ruby/test_sleep.rb
+++ b/test/ruby/test_sleep.rb
@@ -6,7 +6,7 @@ class TestSleep < Test::Unit::TestCase
     start = Time.now
     sleep 5
     slept = Time.now-start
-    bottom = /Linux ([\d.]+)/ =~ `uname -sr` && ($1.split('.')<=>%w/2 6.18/<1 ? 4.99 : 5.0
+    bottom = /linux/ =~ RUBY_PLATFORM && /Linux ([\d.]+)/ =~ `uname -sr` && ($1.split('.')<=>%w/2 6.18/)<1 ? 4.99 : 5.0
     assert_operator(bottom, :<=, slept)
     assert_operator(slept, :<=, 6.0, "[ruby-core:18015]: longer than expected")
   ensure