diff --git a/Marlin/Conditionals.h b/Marlin/Conditionals.h
index 6e62bf7eed..bf1886277c 100644
--- a/Marlin/Conditionals.h
+++ b/Marlin/Conditionals.h
@@ -5,6 +5,7 @@
 #ifndef CONDITIONALS_H
   #define CONDITIONALS_H
 
+  #include "Arduino.h"
   #include "pins.h"
 
   /**
diff --git a/Marlin/SanityCheck.h b/Marlin/SanityCheck.h
index cad6353aef..1a07f6b44d 100644
--- a/Marlin/SanityCheck.h
+++ b/Marlin/SanityCheck.h
@@ -111,13 +111,13 @@
 
       // Make sure probing points are reachable
       #if LEFT_PROBE_BED_POSITION < MIN_PROBE_X
-        #error "The given LEFT_PROBE_BED_POSITION can't be reached by the probe."
+        #error The given LEFT_PROBE_BED_POSITION can't be reached by the probe.
       #elif RIGHT_PROBE_BED_POSITION > MAX_PROBE_X
-        #error "The given RIGHT_PROBE_BED_POSITION can't be reached by the probe."
+        #error The given RIGHT_PROBE_BED_POSITION can't be reached by the probe.
       #elif FRONT_PROBE_BED_POSITION < MIN_PROBE_Y
-        #error "The given FRONT_PROBE_BED_POSITION can't be reached by the probe."
+        #error The given FRONT_PROBE_BED_POSITION can't be reached by the probe.
       #elif BACK_PROBE_BED_POSITION > MAX_PROBE_Y
-        #error "The given BACK_PROBE_BED_POSITION can't be reached by the probe."
+        #error The given BACK_PROBE_BED_POSITION can't be reached by the probe.
       #endif
 
       #define PROBE_SIZE_X (X_PROBE_OFFSET_FROM_EXTRUDER * (AUTO_BED_LEVELING_GRID_POINTS-1))