diff --git a/backport.diff b/backport.diff
old mode 100755
new mode 100644
diff --git a/muduo/base/Thread.cc b/muduo/base/Thread.cc
index 42c02ab90..3d8818b5e 100644
--- a/muduo/base/Thread.cc
+++ b/muduo/base/Thread.cc
@@ -146,8 +146,8 @@ bool CurrentThread::isMainThread()
 void CurrentThread::sleepUsec(int64_t usec)
 {
   struct timespec ts = { 0, 0 };
-  ts.tv_sec = usec / Timestamp::kMicroSecondsPerSecond;
-  ts.tv_nsec = usec % Timestamp::kMicroSecondsPerSecond * 1000;
+  ts.tv_sec = static_cast<time_t>(usec / Timestamp::kMicroSecondsPerSecond);
+  ts.tv_nsec = static_cast<long>(usec % Timestamp::kMicroSecondsPerSecond * 1000);
   ::nanosleep(&ts, NULL);
 }