diff --git a/Adafruit_SPIDevice.cpp b/Adafruit_SPIDevice.cpp
index 5f42145..cc2c58c 100644
--- a/Adafruit_SPIDevice.cpp
+++ b/Adafruit_SPIDevice.cpp
@@ -113,17 +113,16 @@ void Adafruit_SPIDevice::transfer(uint8_t *buffer, size_t len) {
   if (_spi) {
     // hardware SPI is easy
 
-#ifdef SPARK
+#if defined(SPARK)
     _spi->transfer(buffer, buffer, len, NULL);
-#else
-#ifdef STM32
+#elif defined(STM32)
     for (size_t i = 0; i < len; i++) {
       _spi->transfer(buffer[i]);
     }
 #else
     _spi->transfer(buffer, len);
 #endif
-#endif
+
 
     return;
   }