From e2ab78d876137a5ed88d76c0c1cbf0f642713d9a Mon Sep 17 00:00:00 2001
From: Scott Lahteine <github@thinkyhead.com>
Date: Fri, 28 Sep 2018 16:12:19 -0500
Subject: [PATCH] Fix SERIAL_PORT_2 sanity check

---
 Marlin/src/inc/SanityCheck.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Marlin/src/inc/SanityCheck.h b/Marlin/src/inc/SanityCheck.h
index 7c8447c003..b0d6758dc4 100644
--- a/Marlin/src/inc/SanityCheck.h
+++ b/Marlin/src/inc/SanityCheck.h
@@ -365,7 +365,7 @@
   #error "Set SERIAL_PORT to the port on your board. Usually this is 0."
 #endif
 
-#if SERIAL_PORT_2 && NUM_SERIAL < 2
+#if defined(SERIAL_PORT_2) && NUM_SERIAL < 2
   #error "SERIAL_PORT_2 is not supported for your MOTHERBOARD. Disable it to continue."
 #endif
 
-- 
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