diff --git a/libraries/MySensors/core/MyGatewayTransportEthernet.cpp b/libraries/MySensors/core/MyGatewayTransportEthernet.cpp
index b848de1..84a4767 100644
--- a/libraries/MySensors/core/MyGatewayTransportEthernet.cpp
+++ b/libraries/MySensors/core/MyGatewayTransportEthernet.cpp
@@ -76,7 +76,7 @@ typedef struct
 // On W5100 boards with SPI_EN exposed we can use the real SPI bus together with radio
 // (if we enable it during usage)
 #ifdef MY_W5100_SPI_EN
-	void _w5100_spi_en(boolean enable)
+	void _w5100_spi_en(bool enable)
 	{
 	  if (enable)
 	  {
diff --git a/libraries/MySensors/core/MyInclusionMode.cpp b/libraries/MySensors/core/MyInclusionMode.cpp
index b66be24..e55612f 100644
--- a/libraries/MySensors/core/MyInclusionMode.cpp
+++ b/libraries/MySensors/core/MyInclusionMode.cpp
@@ -33,7 +33,7 @@ inline void inclusionInit() {
 }
 
 
-void inclusionModeSet(boolean newMode) {
+void inclusionModeSet(bool newMode) {
   if (newMode != _inclusionMode) {
     _inclusionMode = newMode;
     // Send back mode change to controller
diff --git a/libraries/MySensors/core/MyInclusionMode.h b/libraries/MySensors/core/MyInclusionMode.h
index b52b261..9c58c82 100644
--- a/libraries/MySensors/core/MyInclusionMode.h
+++ b/libraries/MySensors/core/MyInclusionMode.h
@@ -26,7 +26,7 @@
 extern bool gatewayTransportSend(MyMessage &message);
 
 void inclusionInit();
-void inclusionModeSet(boolean newMode);
+void inclusionModeSet(bool newMode);
 void inclusionProcess();
 
 
diff --git a/libraries/MySensors/core/MySensorsCore.cpp b/libraries/MySensors/core/MySensorsCore.cpp
index 7e6da88..353999a 100644
--- a/libraries/MySensors/core/MySensorsCore.cpp
+++ b/libraries/MySensors/core/MySensorsCore.cpp
@@ -24,7 +24,7 @@ NodeConfig _nc; // Essential settings for node to work
 MyMessage _msg;  // Buffer for incoming messages.
 MyMessage _msgTmp; // Buffer for temporary messages (acks and nonces among others).
 
-boolean _nodeRegistered = false;
+bool _nodeRegistered = false;
 
 #if defined(MY_DEBUG)
 	char _convBuf[MAX_PAYLOAD*2+1];
@@ -231,7 +231,7 @@ ControllerConfig getConfig() {
 }
 
 
-boolean _sendRoute(MyMessage &message) {
+bool _sendRoute(MyMessage &message) {
 	#if defined(MY_CORE_ONLY)
 		(void)message;
 	#endif
diff --git a/libraries/MySensors/core/MySensorsCore.h b/libraries/MySensors/core/MySensorsCore.h
index 4f3233e..cde3765 100644
--- a/libraries/MySensors/core/MySensorsCore.h
+++ b/libraries/MySensors/core/MySensorsCore.h
@@ -247,7 +247,7 @@ void _infiniteLoop();
 
 void _registerNode();
 
-boolean _sendRoute(MyMessage &message);
+bool _sendRoute(MyMessage &message);
 
 extern NodeConfig _nc;
 extern MyMessage _msg;  // Buffer for incoming messages.
diff --git a/libraries/MySensors/core/MyTransportRS485.cpp b/libraries/MySensors/core/MyTransportRS485.cpp
index 8b62dc6..d488ab9 100644
--- a/libraries/MySensors/core/MyTransportRS485.cpp
+++ b/libraries/MySensors/core/MyTransportRS485.cpp
@@ -126,7 +126,7 @@ void _serialReset(){
 // our station ID, then look for a registered command that matches the
 // command code.  If all the above is true, execute the command's
 // function.
-boolean _serialProcess()
+bool _serialProcess()
 {
     char inch;
     unsigned char i;