diff --git a/etc/sysctl.conf b/etc/sysctl.conf
index 51c2b028a8..1930b1e957 100644
--- a/etc/sysctl.conf
+++ b/etc/sysctl.conf
@@ -19,3 +19,4 @@ net.inet.tcp.delayed_ack=0
 net.inet.udp.maxdgram=57344
 kern.rndtest.verbose=0
 net.link.bridge.pfil_onlyip=0
+net.link.tap.user_open=1