diff --git a/ChangeLog b/ChangeLog
index 0f58a8658f..348826991a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Jan  5 12:31:23 2007  GOTOU Yuuzou  <gotoyuzo@notwork.org>
+
+	* thread_pthread.ci (native_sleep): fix tv_nsec overflow.
+
 Thu Jan  4 20:01:29 2007  Koichi Sasada  <ko1@atdot.net>
 
 	* common.mk : rename yarv-test-[all/each] to compare-test[/-each].
diff --git a/thread_pthread.ci b/thread_pthread.ci
index df1ed7e5d4..3a3249e531 100644
--- a/thread_pthread.ci
+++ b/thread_pthread.ci
@@ -254,6 +254,10 @@ native_sleep(yarv_thread_t *th, struct timeval *tv)
 	gettimeofday(&tvn, NULL);
 	ts.tv_sec = tvn.tv_sec + tv->tv_sec;
 	ts.tv_nsec = (tvn.tv_usec + tv->tv_usec) * 1000;
+        if (ts.tv_nsec >= 1000000000){
+	    ts.tv_sec += 1;
+	    ts.tv_nsec -= 1000000000;
+        }
     }
     
     th->status = THREAD_STOPPED;