diff --git a/src/modules/px4iofirmware/sbus.c b/src/modules/px4iofirmware/sbus.c
index d76ec55f05..82701f0b1a 100644
--- a/src/modules/px4iofirmware/sbus.c
+++ b/src/modules/px4iofirmware/sbus.c
@@ -163,8 +163,8 @@ sbus1_output(uint16_t *values, uint16_t num_values)
 void
 sbus2_output(uint16_t *values, uint16_t num_values)
 {
-	char b = 'B';
-	write(sbus_fd, &b, 1);
+	// XXX S.BUS2 is not implemented, fall back to S.BUS1
+	sbus1_output(values, num_values);
 }
 
 bool