diff --git a/settings.h b/settings.h
index ea114ed3..d49b7aa5 100644
--- a/settings.h
+++ b/settings.h
@@ -98,7 +98,7 @@
 #define XMEM_RELEASE_SPI() (void(0))
 #endif
 
-#ifdef __MK20DX128__
+#if defined(__MK20DX128__) || defined(__MK20DX256__)
 #define USING_SPI4TEENSY3 USE_SPI4TEENSY3
 #else
 #define USING_SPI4TEENSY3 0
diff --git a/usbhost.h b/usbhost.h
index bc65e106..81949431 100644
--- a/usbhost.h
+++ b/usbhost.h
@@ -67,7 +67,7 @@ typedef SPi< Pb1, Pb2, Pb3, Pb0 > spi;
 typedef SPi< Pb5, Pb3, Pb4, Pb2 > spi;
 #elif defined(__AVR_ATmega644__) || defined(__AVR_ATmega644P__) || defined(__AVR_ATmega1284__) || defined(__AVR_ATmega1284P__)
 typedef SPi< Pb7, Pb5, Pb6, Pb4 > spi;
-#elif defined(__MK20DX128__)
+#elif defined(__MK20DX128__) || defined(__MK20DX256__)
 typedef SPi< P13, P11, P12, P10 > spi;
 #else
 #error "No SPI entry in usbhost.h"