diff --git a/pkg/relay/relay.go b/pkg/relay/relay.go
index 73d0b3a..e1b5bff 100644
--- a/pkg/relay/relay.go
+++ b/pkg/relay/relay.go
@@ -40,12 +40,12 @@ func (r *device) Close() error {
 }
 
 func (r *device) OnAll() error {
-	_, err := r.c.WriteMultipleCoils(uint16(0), 16, []byte{0xFF, 0xFF})
+	_, err := r.c.WriteMultipleCoils(0, 16, []byte{0xFF, 0xFF})
 	return err
 }
 
 func (r *device) OffAll() error {
-	_, err := r.c.WriteMultipleCoils(uint16(0), 16, []byte{0x00, 0x00})
+	_, err := r.c.WriteMultipleCoils(0, 16, []byte{0x00, 0x00})
 	return err
 }