From 544b16639e314af3db5bbe4673089556d7b63ff1 Mon Sep 17 00:00:00 2001
From: Scott Lahteine <github@thinkyhead.com>
Date: Wed, 6 May 2020 01:15:05 -0500
Subject: [PATCH] Fix poll_runout_states bug

---
 Marlin/src/feature/runout.h | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/Marlin/src/feature/runout.h b/Marlin/src/feature/runout.h
index 056fc4f5cd..a170d5e323 100644
--- a/Marlin/src/feature/runout.h
+++ b/Marlin/src/feature/runout.h
@@ -140,6 +140,7 @@ class FilamentSensorBase {
       #define _INIT_RUNOUT(N) INIT_RUNOUT_PIN(FIL_RUNOUT##N##_PIN);
       REPEAT_S(1, INCREMENT(NUM_RUNOUT_SENSORS), _INIT_RUNOUT)
       #undef _INIT_RUNOUT
+      #undef INIT_RUNOUT_PIN
     }
 
     // Return a bitmask of runout pin states
@@ -151,10 +152,8 @@ class FilamentSensorBase {
 
     // Return a bitmask of runout flag states (1 bits always indicates runout)
     static inline uint8_t poll_runout_states() {
-      return poll_runout_pins() ^ uint8_t(TERN0(FIL_RUNOUT_INVERTING, _BV(NUM_RUNOUT_SENSORS) - 1));
+      return poll_runout_pins() ^ uint8_t(TERN(FIL_RUNOUT_INVERTING, 0, _BV(NUM_RUNOUT_SENSORS) - 1));
     }
-
-  #undef INIT_RUNOUT_PIN
 };
 
 #if ENABLED(FILAMENT_MOTION_SENSOR)