diff --git a/hardware/arduino/avr/libraries/SoftwareSerial/src/SoftwareSerial.cpp b/hardware/arduino/avr/libraries/SoftwareSerial/src/SoftwareSerial.cpp
index 0a16ff710..376762e75 100644
--- a/hardware/arduino/avr/libraries/SoftwareSerial/src/SoftwareSerial.cpp
+++ b/hardware/arduino/avr/libraries/SoftwareSerial/src/SoftwareSerial.cpp
@@ -48,7 +48,7 @@ http://arduiniana.org.
 // Statics
 //
 SoftwareSerial *SoftwareSerial::active_object = 0;
-char SoftwareSerial::_receive_buffer[_SS_MAX_RX_BUFF]; 
+uint8_t SoftwareSerial::_receive_buffer[_SS_MAX_RX_BUFF]; 
 volatile uint8_t SoftwareSerial::_receive_buffer_tail = 0;
 volatile uint8_t SoftwareSerial::_receive_buffer_head = 0;
 
diff --git a/hardware/arduino/avr/libraries/SoftwareSerial/src/SoftwareSerial.h b/hardware/arduino/avr/libraries/SoftwareSerial/src/SoftwareSerial.h
index 622e2a516..26183ba85 100644
--- a/hardware/arduino/avr/libraries/SoftwareSerial/src/SoftwareSerial.h
+++ b/hardware/arduino/avr/libraries/SoftwareSerial/src/SoftwareSerial.h
@@ -66,7 +66,7 @@ private:
   uint16_t _inverse_logic:1;
 
   // static data
-  static char _receive_buffer[_SS_MAX_RX_BUFF]; 
+  static uint8_t _receive_buffer[_SS_MAX_RX_BUFF]; 
   static volatile uint8_t _receive_buffer_tail;
   static volatile uint8_t _receive_buffer_head;
   static SoftwareSerial *active_object;