diff --git a/ChangeLog b/ChangeLog
index 623427d3df..f397d1c56d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sat Aug 16 10:20:17 2014  Eric Wong  <e@80x24.org>
+
+	* time.c (time_timespec): fix tv_nsec overflow
+	  [Bug #10144]
+
 Fri Aug 15 20:34:17 2014  Masaki Suketa <masaki.suketa@nifty.ne.jp>
 
 	* ext/win32ole/win32ole.c: seperate WIN32OLE_EVENT src from
diff --git a/time.c b/time.c
index 04f99f2dca..7ba83bbea7 100644
--- a/time.c
+++ b/time.c
@@ -2354,6 +2354,10 @@ time_timespec(VALUE num, int interval)
 	    d = modf(RFLOAT_VALUE(num), &f);
 	    if (d >= 0) {
 		t.tv_nsec = (int)(d*1e9+0.5);
+		if (t.tv_nsec >= 1000000000) {
+		    t.tv_nsec -= 1000000000;
+		    f += 1;
+		}
 	    }
 	    else if ((t.tv_nsec = (int)(-d*1e9+0.5)) > 0) {
 		t.tv_nsec = 1000000000 - t.tv_nsec;