diff --git a/rtc_base/physical_socket_server.cc b/rtc_base/physical_socket_server.cc
index 080534af2c..f52701c28d 100644
--- a/rtc_base/physical_socket_server.cc
+++ b/rtc_base/physical_socket_server.cc
@@ -1205,22 +1205,26 @@ class Signaler : public EventDispatcher {
   bool* pf_;
 };
 
-PhysicalSocketServer::PhysicalSocketServer() : fWait_(false) {
+PhysicalSocketServer::PhysicalSocketServer()
+    :
+#if defined(WEBRTC_USE_EPOLL)
+      // Since Linux 2.6.8, the size argument is ignored, but must be greater
+      // than zero. Before that the size served as hint to the kernel for the
+      // amount of space to initially allocate in internal data structures.
+      epoll_fd_(epoll_create(FD_SETSIZE)),
+#endif
+#if defined(WEBRTC_WIN)
+      socket_ev_(WSACreateEvent()),
+#endif
+      fWait_(false) {
 #if defined(WEBRTC_USE_EPOLL)
-  // Since Linux 2.6.8, the size argument is ignored, but must be greater than
-  // zero. Before that the size served as hint to the kernel for the amount of
-  // space to initially allocate in internal data structures.
-  epoll_fd_ = epoll_create(FD_SETSIZE);
   if (epoll_fd_ == -1) {
     // Not an error, will fall back to "select" below.
     RTC_LOG_E(LS_WARNING, EN, errno) << "epoll_create";
-    epoll_fd_ = INVALID_SOCKET;
+    // Note that -1 == INVALID_SOCKET, the alias used by later checks.
   }
 #endif
   signal_wakeup_ = new Signaler(this, &fWait_);
-#if defined(WEBRTC_WIN)
-  socket_ev_ = WSACreateEvent();
-#endif
 }
 
 PhysicalSocketServer::~PhysicalSocketServer() {
diff --git a/rtc_base/physical_socket_server.h b/rtc_base/physical_socket_server.h
index a71810f3db..01e91f33ce 100644
--- a/rtc_base/physical_socket_server.h
+++ b/rtc_base/physical_socket_server.h
@@ -117,7 +117,7 @@ class RTC_EXPORT PhysicalSocketServer : public SocketServer {
   bool WaitEpoll(int cms);
   bool WaitPoll(int cms, Dispatcher* dispatcher);
 
-  int epoll_fd_ = INVALID_SOCKET;
+  const int epoll_fd_ = INVALID_SOCKET;
   std::vector<struct epoll_event> epoll_events_;
 #endif  // WEBRTC_USE_EPOLL
   DispatcherSet dispatchers_;
@@ -126,10 +126,10 @@ class RTC_EXPORT PhysicalSocketServer : public SocketServer {
   bool processing_dispatchers_ = false;
   Signaler* signal_wakeup_;
   CriticalSection crit_;
-  bool fWait_;
 #if defined(WEBRTC_WIN)
-  WSAEVENT socket_ev_;
+  const WSAEVENT socket_ev_;
 #endif
+  bool fWait_;
 };
 
 class PhysicalSocket : public AsyncSocket, public sigslot::has_slots<> {