diff --git a/ChangeLog b/ChangeLog
index 47d05f8ce4..86f36ce5c3 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Fri Jun 17 04:48:22 2011  Koichi Sasada  <ko1@atdot.net>
+
+	* thread_pthread.c, thread_pthread.h: remove unused variables.
+	  (native_thread_data_t::gvl_cond, native_thread_data_t::gvl_next)
+
 Thu Jun 16 14:32:31 2011  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* time.c (rb_time_new): prevent overflow by "* 1000".
diff --git a/thread_pthread.c b/thread_pthread.c
index 496600e478..ff9de86379 100644
--- a/thread_pthread.c
+++ b/thread_pthread.c
@@ -422,14 +422,12 @@ static void
 native_thread_init(rb_thread_t *th)
 {
     native_cond_initialize(&th->native_thread_data.sleep_cond, RB_CONDATTR_CLOCK_MONOTONIC);
-    native_cond_initialize(&th->native_thread_data.gvl_cond, 0);
     ruby_thread_set_native(th);
 }
 
 static void
 native_thread_destroy(rb_thread_t *th)
 {
-    native_cond_destroy(&th->native_thread_data.gvl_cond);
     native_cond_destroy(&th->native_thread_data.sleep_cond);
 }
 
diff --git a/thread_pthread.h b/thread_pthread.h
index 3167efc050..e693fba299 100644
--- a/thread_pthread.h
+++ b/thread_pthread.h
@@ -28,8 +28,6 @@ typedef struct rb_thread_cond_struct {
 typedef struct native_thread_data_struct {
     void *signal_thread_list;
     rb_thread_cond_t sleep_cond;
-    rb_thread_cond_t gvl_cond;
-    struct rb_thread_struct *gvl_next;
 } native_thread_data_t;
 
 #include <semaphore.h>