diff --git a/muduo/net/Channel.cc b/muduo/net/Channel.cc
index 1e9a40ae7..e5ffce30d 100644
--- a/muduo/net/Channel.cc
+++ b/muduo/net/Channel.cc
@@ -12,15 +12,9 @@
 
 #include <sstream>
 
-#include <poll.h>
-
 using namespace muduo;
 using namespace muduo::net;
 
-const int Channel::kNoneEvent = 0;
-const int Channel::kReadEvent = POLLIN | POLLPRI;
-const int Channel::kWriteEvent = POLLOUT;
-
 Channel::Channel(EventLoop* loop, int fd__)
   : loop_(loop),
     fd_(fd__),
diff --git a/muduo/net/Channel.h b/muduo/net/Channel.h
index bafa224fa..945ceebdd 100644
--- a/muduo/net/Channel.h
+++ b/muduo/net/Channel.h
@@ -16,6 +16,7 @@
 
 #include <functional>
 #include <memory>
+#include <poll.h>
 
 namespace muduo
 {
@@ -86,9 +87,9 @@ class Channel : noncopyable
   void update();
   void handleEventWithGuard(Timestamp receiveTime);
 
-  static const int kNoneEvent;
-  static const int kReadEvent;
-  static const int kWriteEvent;
+  static constexpr int kNoneEvent = 0;
+  static constexpr int kReadEvent = POLLIN | POLLPRI;
+  static constexpr int kWriteEvent = POLLOUT;
 
   EventLoop* loop_;
   const int  fd_;