diff --git a/net/netmon/netmon.go b/net/netmon/netmon.go
index f2dd37f1d..bd3d13d66 100644
--- a/net/netmon/netmon.go
+++ b/net/netmon/netmon.go
@@ -596,7 +596,7 @@ func (m *Monitor) pollWallTime() {
 //
 // We don't do this on mobile platforms for battery reasons, and because these
 // platforms don't really sleep in the same way.
-const shouldMonitorTimeJump = runtime.GOOS != "android" && runtime.GOOS != "ios"
+const shouldMonitorTimeJump = runtime.GOOS != "android" && runtime.GOOS != "ios" && runtime.GOOS != "plan9"
 
 // checkWallTimeAdvanceLocked reports whether wall time jumped more than 150% of
 // pollWallTimeInterval, indicating we probably just came out of sleep. Once a