diff --git a/libraries/Ethernet/utility/w5100.cpp b/libraries/Ethernet/utility/w5100.cpp
index f4b07f512..06442268c 100644
--- a/libraries/Ethernet/utility/w5100.cpp
+++ b/libraries/Ethernet/utility/w5100.cpp
@@ -25,6 +25,8 @@ W5100Class W5100;
 
 void W5100Class::init(void)
 {
+  initSS();
+
   writeMR(1<<RST);
   writeTMSR(0x55);
   writeRMSR(0x55);