diff --git a/src/pkg/net/file_unix.go b/src/pkg/net/file_unix.go
index 0a64080..4c8403e 100644
--- a/src/pkg/net/file_unix.go
+++ b/src/pkg/net/file_unix.go
@@ -20,6 +20,10 @@
 	}
 	syscall.CloseOnExec(fd)
 	syscall.ForkLock.RUnlock()
+	if err = syscall.SetNonblock(fd, true); err != nil {
+		closesocket(fd)
+		return nil, err
+	}
 
 	sotype, err := syscall.GetsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_TYPE)
 	if err != nil {