diff --git a/settings.h b/settings.h
index e3d0ed1d..e6ed5cf1 100644
--- a/settings.h
+++ b/settings.h
@@ -137,7 +137,7 @@ e-mail   :  support@circuitsathome.com
 #define USING_SPI4TEENSY3 0
 #endif
 
-#if defined(ARDUINO_SAM_DUE) && defined(__SAM3X8E__)
+#if (defined(ARDUINO_SAM_DUE) && defined(__SAM3X8E__)) || defined(RBL_NRF51822)
 #include <SPI.h> // Use the Arduino SPI library for the Arduino Due
 #endif
 
diff --git a/usbhost.h b/usbhost.h
index 46ef1346..f35bc0f4 100644
--- a/usbhost.h
+++ b/usbhost.h
@@ -27,9 +27,7 @@ e-mail   :  support@circuitsathome.com
 #include <sys/types.h>
 #endif
 
-#if defined(RBL_NRF51822)
-#include "SPI.H"
-#endif
+
 /* SPI initialization */
 template< typename SPI_CLK, typename SPI_MOSI, typename SPI_MISO, typename SPI_SS > class SPi {
 public: