diff --git a/Marlin/src/HAL/HAL_LPC1768/HAL.h b/Marlin/src/HAL/HAL_LPC1768/HAL.h
index 907b550c3..cf54cb1d7 100644
--- a/Marlin/src/HAL/HAL_LPC1768/HAL.h
+++ b/Marlin/src/HAL/HAL_LPC1768/HAL.h
@@ -35,6 +35,10 @@
 
 #include <stdint.h>
 #include <stdarg.h>
+
+#undef min
+#undef max
+
 #include <algorithm>
 
 void _printf (const  char *format, ...);
@@ -52,7 +56,8 @@ extern "C" volatile uint32_t _millis;
 #define B01 1
 #define B10 2
 
-#include "arduino.h"
+#include "include/arduino.h"
+
 #include "pinmapping.h"
 #include "fastio.h"
 #include "watchdog.h"
diff --git a/Marlin/src/HAL/HAL_TEENSY35_36/HAL_Teensy.h b/Marlin/src/HAL/HAL_TEENSY35_36/HAL_Teensy.h
index 379b363dd..f4de615a6 100644
--- a/Marlin/src/HAL/HAL_TEENSY35_36/HAL_Teensy.h
+++ b/Marlin/src/HAL/HAL_TEENSY35_36/HAL_Teensy.h
@@ -32,6 +32,10 @@
 
 #include <Arduino.h>
 
+// Redefine sq macro defined by teensy3/wiring.h
+#undef sq
+#define sq(x) ((x)*(x))
+
 #include "fastio_Teensy.h"
 #include "watchdog_Teensy.h"