diff --git a/avr/libraries/Wire/src/Wire.cpp b/avr/libraries/Wire/src/Wire.cpp
index 3dcdeb148..8870014d0 100755
--- a/avr/libraries/Wire/src/Wire.cpp
+++ b/avr/libraries/Wire/src/Wire.cpp
@@ -68,8 +68,6 @@ void TwoWire::begin(void)
 void TwoWire::begin(uint8_t address)
 {
   begin();
-  twi_attachSlaveTxEvent(onRequestService);
-  twi_attachSlaveRxEvent(onReceiveService);
   twi_setAddress(address);
 }
 
diff --git a/avr/libraries/Wire/src/utility/twi.c b/avr/libraries/Wire/src/utility/twi.c
index 6882a3d2c..2ae0d6789 100755
--- a/avr/libraries/Wire/src/utility/twi.c
+++ b/avr/libraries/Wire/src/utility/twi.c
@@ -314,7 +314,6 @@ uint8_t twi_transmit(const uint8_t* data, uint8_t length)
   }
   
   // set length and copy data into tx buffer
-  twi_txBufferLength = length;
   for(i = 0; i < length; ++i){
     twi_txBuffer[twi_txBufferLength+i] = data[i];
   }
diff --git a/avr/libraries/Wire1/src/Wire1.cpp b/avr/libraries/Wire1/src/Wire1.cpp
index 41db40190..47e24f07e 100755
--- a/avr/libraries/Wire1/src/Wire1.cpp
+++ b/avr/libraries/Wire1/src/Wire1.cpp
@@ -68,8 +68,6 @@ void TwoWire1::begin(void)
 void TwoWire1::begin(uint8_t address)
 {
   begin();
-  twi_attachSlaveTxEvent1(onRequestService);
-  twi_attachSlaveRxEvent1(onReceiveService);
   twi_setAddress1(address);
 }
 
diff --git a/avr/libraries/Wire1/src/utility/twi1.c b/avr/libraries/Wire1/src/utility/twi1.c
index 4929ad627..b44fbf9f4 100755
--- a/avr/libraries/Wire1/src/utility/twi1.c
+++ b/avr/libraries/Wire1/src/utility/twi1.c
@@ -314,7 +314,6 @@ uint8_t twi_transmit1(const uint8_t* data, uint8_t length)
   }
   
   // set length and copy data into tx buffer
-  twi_txBufferLength = length;
   for(i = 0; i < length; ++i){
     twi_txBuffer[twi_txBufferLength+i] = data[i];
   }