diff --git a/libraries/Ethernet/utility/w5100.h b/libraries/Ethernet/utility/w5100.h
index 9872c7ccb..35d23ed41 100755
--- a/libraries/Ethernet/utility/w5100.h
+++ b/libraries/Ethernet/utility/w5100.h
@@ -324,6 +324,10 @@ private:
   inline static void initSS()    { DDRB  |=  _BV(4); };
   inline static void setSS()     { PORTB &= ~_BV(4); };
   inline static void resetSS()   { PORTB |=  _BV(4); };
+#elif defined(__AVR_ATmega32U4__) || defined(__AVR_AT90USB1286__) || defined(__AVR_AT90USB646__) || defined(__AVR_AT90USB162__)
+  inline static void initSS()    { DDRB  |=  _BV(0); };
+  inline static void setSS()     { PORTB &= ~_BV(0); };
+  inline static void resetSS()   { PORTB |=  _BV(0); }; 
 #else
   inline static void initSS()    { DDRB  |=  _BV(2); };
   inline static void setSS()     { PORTB &= ~_BV(2); };