diff --git a/src/Adafruit_GPS.cpp b/src/Adafruit_GPS.cpp
index 014f3bf..04ec08c 100644
--- a/src/Adafruit_GPS.cpp
+++ b/src/Adafruit_GPS.cpp
@@ -40,7 +40,7 @@ static bool strStartsWith(const char *str, const char *prefix);
 */
 /**************************************************************************/
 bool Adafruit_GPS::begin(uint32_t baud_or_i2caddr) {
-#if (defined(__AVR__) || defined(ESP8266)) && defined(USE_SW_SERIAL)
+#if (defined(__AVR__) || ((defined(ARDUINO_ARCH_RENESAS_UNO) || defined(ESP8266)) && !defined(NO_SW_SERIAL)))
   if (gpsSwSerial) {
     gpsSwSerial->begin(baud_or_i2caddr);
   }
@@ -78,7 +78,7 @@ bool Adafruit_GPS::begin(uint32_t baud_or_i2caddr) {
     @param ser Pointer to SoftwareSerial device
 */
 /**************************************************************************/
-#if (defined(__AVR__) || defined(ESP8266)) && defined(USE_SW_SERIAL)
+#if (defined(__AVR__) || ((defined(ARDUINO_ARCH_RENESAS_UNO) || defined(ESP8266)) && !defined(NO_SW_SERIAL)))
 Adafruit_GPS::Adafruit_GPS(SoftwareSerial *ser) {
   common_init();     // Set everything to common state, then...
   gpsSwSerial = ser; // ...override gpsSwSerial with value passed.
@@ -147,7 +147,7 @@ Adafruit_GPS::Adafruit_GPS() {
 */
 /**************************************************************************/
 void Adafruit_GPS::common_init(void) {
-#if (defined(__AVR__) || defined(ESP8266)) && defined(USE_SW_SERIAL)
+#if (defined(__AVR__) || ((defined(ARDUINO_ARCH_RENESAS_UNO) || defined(ESP8266)) && !defined(NO_SW_SERIAL)))
   gpsSwSerial = NULL; // Set both to NULL, then override correct
 #endif
   gpsHwSerial = NULL; // port pointer in corresponding constructor
@@ -196,7 +196,7 @@ size_t Adafruit_GPS::available(void) {
   if (paused)
     return 0;
 
-#if (defined(__AVR__) || defined(ESP8266)) && defined(USE_SW_SERIAL)
+#if (defined(__AVR__) || ((defined(ARDUINO_ARCH_RENESAS_UNO) || defined(ESP8266)) && !defined(NO_SW_SERIAL)))
   if (gpsSwSerial) {
     return gpsSwSerial->available();
   }
@@ -223,7 +223,7 @@ size_t Adafruit_GPS::available(void) {
 */
 /**************************************************************************/
 size_t Adafruit_GPS::write(uint8_t c) {
-#if (defined(__AVR__) || defined(ESP8266)) && defined(USE_SW_SERIAL)
+#if (defined(__AVR__) || ((defined(ARDUINO_ARCH_RENESAS_UNO) || defined(ESP8266)) && !defined(NO_SW_SERIAL)))
   if (gpsSwSerial) {
     return gpsSwSerial->write(c);
   }
@@ -279,7 +279,7 @@ char Adafruit_GPS::read(void) {
   if (paused || noComms)
     return c;
 
-#if (defined(__AVR__) || defined(ESP8266)) && defined(USE_SW_SERIAL)
+#if (defined(__AVR__) || ((defined(ARDUINO_ARCH_RENESAS_UNO) || defined(ESP8266)) && !defined(NO_SW_SERIAL)))
   if (gpsSwSerial) {
     if (!gpsSwSerial->available())
       return c;
diff --git a/src/Adafruit_GPS.h b/src/Adafruit_GPS.h
index 4043c04..f3bf0c6 100644
--- a/src/Adafruit_GPS.h
+++ b/src/Adafruit_GPS.h
@@ -39,7 +39,7 @@
 #endif
 #endif
 
-#if (defined(__AVR__) || defined(ESP8266)) && !defined(NO_SW_SERIAL)
+#if (defined(__AVR__) || ((defined(ARDUINO_ARCH_RENESAS_UNO) || defined(ESP8266)) && !defined(NO_SW_SERIAL)))
 #define USE_SW_SERIAL ///< insert line `#define NO_SW_SERIAL` before this header
                       ///< if you don't want to include software serial in the
 #endif                ///< library