diff --git a/libraries/SPI/src/SPI.h b/libraries/SPI/src/SPI.h
index 2f1c7c6..2b9d87a 100644
--- a/libraries/SPI/src/SPI.h
+++ b/libraries/SPI/src/SPI.h
@@ -10,6 +10,10 @@
 
 #include "drivers/SPI.h"
 
+// SPI_HAS_TRANSACTION means SPI has beginTransaction(), endTransaction(),
+// usingInterrupt(), and SPISetting(clock, bitOrder, dataMode)
+#define SPI_HAS_TRANSACTION 1
+
 namespace arduino {
 
 class MbedSPI : public SPIClass