diff --git a/ChangeLog b/ChangeLog
index 85abbc133a..039f1be95e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+Tue Nov 20 09:48:34 2012  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
+
+	* signal.c (rb_get_next_signal): removed pointless signal
+	  disabling. pthread_sigmask() only changes current thread
+	  mask.
+
 Tue Nov 20 09:36:55 2012  KOSAKI Motohiro  <kosaki.motohiro@gmail.com>
 
 	* signal.c (install_sighandler): added comments why we need
diff --git a/signal.c b/signal.c
index 3f4a90b522..d97d297c1c 100644
--- a/signal.c
+++ b/signal.c
@@ -562,12 +562,8 @@ rb_get_next_signal(void)
     if (signal_buff.size != 0) {
 	for (i=1; i<RUBY_NSIG; i++) {
 	    if (signal_buff.cnt[i] > 0) {
-		rb_disable_interrupt();
-		{
-		    ATOMIC_DEC(signal_buff.cnt[i]);
-		    ATOMIC_DEC(signal_buff.size);
-		}
-		rb_enable_interrupt();
+		ATOMIC_DEC(signal_buff.cnt[i]);
+		ATOMIC_DEC(signal_buff.size);
 		sig = i;
 		break;
 	    }