diff --git a/charger/alfen.go b/charger/alfen.go
index 9107b9301..246137913 100644
--- a/charger/alfen.go
+++ b/charger/alfen.go
@@ -184,7 +184,7 @@ var _ api.ChargePhases = (*Alfen)(nil)
 
 // Phases1p3p implements the api.ChargePhases interface
 func (c *Alfen) Phases1p3p(phases int) error {
-	_, err := c.conn.WriteSingleRegister(alfenRegPhases, uint16(phases<<8))
+	_, err := c.conn.WriteSingleRegister(alfenRegPhases, uint16(phases))
 	return err
 }