diff --git a/STM32/libraries/Wire/src/Wire.cpp b/STM32/libraries/Wire/src/Wire.cpp
index b0751d3..0ce0d07 100644
--- a/STM32/libraries/Wire/src/Wire.cpp
+++ b/STM32/libraries/Wire/src/Wire.cpp
@@ -302,6 +302,10 @@ void TwoWire::flush(void) {
 
 }
 
+void TwoWire::stm32SetInstance(I2C_TypeDef *instance) {
+    handle.Instance = instance;
+}
+
 void TwoWire::stm32SetSDA(uint8_t sda) {
     sdaPort = variant_pin_list[sda].port;
     sdaPin = variant_pin_list[sda].pin_mask;
diff --git a/STM32/libraries/Wire/src/Wire.h b/STM32/libraries/Wire/src/Wire.h
index 7f177bc..5404542 100644
--- a/STM32/libraries/Wire/src/Wire.h
+++ b/STM32/libraries/Wire/src/Wire.h
@@ -82,6 +82,7 @@ class TwoWire : public Stream {
     void onReceive( void (*)(int) );
     void onRequest( void (*)(void) );
 
+    void stm32SetInstance(I2C_TypeDef *instance);
     void stm32SetSDA(uint8_t sda);
     void stm32SetSCL(uint8_t scl);