diff --git a/hems/eebus/eebus.go b/hems/eebus/eebus.go
index 0fefd5fd5..42cf790ff 100644
--- a/hems/eebus/eebus.go
+++ b/hems/eebus/eebus.go
@@ -171,7 +171,6 @@ func (c *EEBus) Run() {
 
 // TODO check state machine against spec
 func (c *EEBus) run() error {
-	c.mux.RLock()
 	c.mux.Lock()
 	defer c.mux.Unlock()