diff --git a/APMrover2/system.pde b/APMrover2/system.pde
index 567e82fb39..302d922b7b 100644
--- a/APMrover2/system.pde
+++ b/APMrover2/system.pde
@@ -292,7 +292,6 @@ static void startup_ground(void)
 	demo_servos(3);
 
     hal.uartA->set_blocking_writes(false);
-    hal.uartB->set_blocking_writes(false);
     hal.uartC->set_blocking_writes(false);
 
 	gcs_send_text_P(SEVERITY_LOW,PSTR("\n\n Ready to drive."));