diff --git a/ChangeLog b/ChangeLog
index 3ace5e1e06..e360c3bc98 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon Jun  1 03:52:55 2015  Koichi Sasada  <ko1@atdot.net>
+
+	* test/ruby/test_gc.rb: increase timeout seconds for GC stressful
+	  debugging.
+
 Sun May 31 04:18:06 2015  Koichi Sasada  <ko1@atdot.net>
 
 	* method.h: fix typo of comments.
diff --git a/test/ruby/test_gc.rb b/test/ruby/test_gc.rb
index fd858f2c69..56b63062c5 100644
--- a/test/ruby/test_gc.rb
+++ b/test/ruby/test_gc.rb
@@ -252,7 +252,7 @@ class TestGc < Test::Unit::TestCase
   end
 
   def test_profiler_clear
-    assert_separately %w[--disable-gem], __FILE__, __LINE__, <<-'eom'
+    assert_separately %w[--disable-gem], __FILE__, __LINE__, <<-'eom', timeout: 30
     GC::Profiler.enable
 
     GC.start