diff --git a/Adafruit_GPS.h b/Adafruit_GPS.h
index 19bb003..63d1217 100644
--- a/Adafruit_GPS.h
+++ b/Adafruit_GPS.h
@@ -29,6 +29,7 @@
 #define USE_SW_SERIAL ///< comment this out if you don't want to include software serial in the library
 #define GPS_DEFAULT_I2C_ADDR 0x10  ///< The default address for I2C transport of GPS data
 #define GPS_MAX_I2C_TRANSFER 32  ///< The max number of bytes we'll try to read at once
+#define GPS_MAX_SPI_TRANSFER 100  ///< The max number of bytes we'll try to read at once
 
 #include "Arduino.h"
 #if (defined(__AVR__) || defined(ESP8266)) && defined(USE_SW_SERIAL)