diff --git a/src/runtime/netpoll.go b/src/runtime/netpoll.go
index 939b27061e..25b1d5d49e 100644
--- a/src/runtime/netpoll.go
+++ b/src/runtime/netpoll.go
@@ -93,7 +93,9 @@ type pollCache struct {
 }
 
 var (
-	netpollInited  uint32
+	netpollInitLock mutex
+	netpollInited   uint32
+
 	pollcache      pollCache
 	netpollWaiters uint32
 )
@@ -104,8 +106,13 @@ func poll_runtime_pollServerInit() {
 }
 
 func netpollGenericInit() {
-	if atomic.Cas(&netpollInited, 0, 1) {
-		netpollinit()
+	if atomic.Load(&netpollInited) == 0 {
+		lock(&netpollInitLock)
+		if netpollInited == 0 {
+			netpollinit()
+			atomic.Store(&netpollInited, 1)
+		}
+		unlock(&netpollInitLock)
 	}
 }