diff --git a/model/MicroBit.cpp b/model/MicroBit.cpp
index acba7789..2312ab50 100644
--- a/model/MicroBit.cpp
+++ b/model/MicroBit.cpp
@@ -71,7 +71,7 @@ MicroBit::MicroBit() :
     io(adc, touchSensor),
     serial(io.usbTx, io.usbRx, NRF_UARTE0),
     _i2c(io.sda, io.scl),
-    i2c(io.P20, io.P20),
+    i2c(io.P20, io.P19),
     power(_i2c, io, systemTimer),
     flash(_i2c, io, power),
     internalFlash(MICROBIT_STORAGE_PAGE, 1, MICROBIT_CODEPAGESIZE),