diff --git a/ChangeLog b/ChangeLog
index 24227c5bc3..55886a3845 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -64,7 +64,7 @@ Sat Dec 15 08:05:56 2012  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
 	test_main_thread_status_at_exit, test_thread_status_in_trap,
 	test_thread_status_raise_after_kill, test_mutex_owned,
 	test_mutex_owned2): move these tests from TestThreadGroup class
-	  to TestThread becuase they are not thread group tests.
+	  to TestThread because they are not thread group tests.
 
 	* test/ruby/test_thread.rb (test_thread_status_raise_after_kill):
 	  add t.join.