diff --git a/ChangeLog b/ChangeLog
index 617434272f..0f15598301 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Wed Jul  9 05:41:40 2014  Eric Wong  <e@80x24.org>
+
+	* thread_pthread.h: remove unneeded semaphore.h include
+
 Wed Jul  9 00:12:28 2014  Keiju Ishitsuka  <keiju@ishitsuka.com>
 
 	* lib/irb/ruby-lex.rb: fix counting indent in identify_string_dvar.
diff --git a/thread_pthread.h b/thread_pthread.h
index d1679f8df3..0717ecb326 100644
--- a/thread_pthread.h
+++ b/thread_pthread.h
@@ -27,8 +27,6 @@ typedef struct native_thread_data_struct {
     rb_nativethread_cond_t sleep_cond;
 } native_thread_data_t;
 
-#include <semaphore.h>
-
 #undef except
 #undef try
 #undef leave