diff --git a/src/machine/machine_nrf.go b/src/machine/machine_nrf.go
index e8859c41..7e12c8a8 100644
--- a/src/machine/machine_nrf.go
+++ b/src/machine/machine_nrf.go
@@ -9,7 +9,6 @@ import (
 )
 
 var (
-	ErrTxSlicesRequired   = errors.New("SPI Tx requires a write or read slice, or both")
 	ErrTxInvalidSliceSize = errors.New("SPI write and read slices must be same size")
 )
 
@@ -348,10 +347,6 @@ func (spi SPI) Transfer(w byte) (byte, error) {
 // 		spi.Tx(nil, rx)
 //
 func (spi SPI) Tx(w, r []byte) error {
-	if w == nil && r == nil {
-		return ErrTxSlicesRequired
-	}
-
 	var err error
 
 	switch {