diff --git a/STM32F1/libraries/Wire/WireBase.cpp b/STM32F1/libraries/Wire/WireBase.cpp
index 73d0398..90ec370 100644
--- a/STM32F1/libraries/Wire/WireBase.cpp
+++ b/STM32F1/libraries/Wire/WireBase.cpp
@@ -59,7 +59,7 @@ void WireBase::beginTransmission(int slave_address) {
     beginTransmission((uint8)slave_address);
 }
 
-uint8 WireBase::endTransmission(uint8 stop) {
+uint8 WireBase::endTransmission(bool stop) {
     uint8 retVal;
     if (tx_buf_overflow) {
         return EDATA;
diff --git a/STM32F1/libraries/Wire/WireBase.h b/STM32F1/libraries/Wire/WireBase.h
index 4038428..5e51ab7 100644
--- a/STM32F1/libraries/Wire/WireBase.h
+++ b/STM32F1/libraries/Wire/WireBase.h
@@ -91,7 +91,7 @@ public:
      * Call the process function to process the message if the TX
      * buffer has not overflowed.
      */
-    uint8 endTransmission(uint8);
+    uint8 endTransmission(bool);
     uint8 endTransmission(void);
 
     /*