diff --git a/libraries/Wire/src/Wire.cpp b/libraries/Wire/src/Wire.cpp
index c0b1a25d7a..055bdec262 100644
--- a/libraries/Wire/src/Wire.cpp
+++ b/libraries/Wire/src/Wire.cpp
@@ -35,12 +35,14 @@ static const uint8_t MASTER_ADDRESS = 0x01;
 
 TwoWire::TwoWire()
 {
+  memset((void *)&_i2c, 0, sizeof(_i2c));
   _i2c.sda = digitalPinToPinName(SDA);
   _i2c.scl = digitalPinToPinName(SCL);
 }
 
 TwoWire::TwoWire(uint32_t sda, uint32_t scl)
 {
+  memset((void *)&_i2c, 0, sizeof(_i2c));
   _i2c.sda = digitalPinToPinName(sda);
   _i2c.scl = digitalPinToPinName(scl);
 }