diff --git a/examples/Peripheral/ButtonLED/ButtonLED.ino b/examples/Peripheral/ButtonLED/ButtonLED.ino
index bd373731..659d466a 100644
--- a/examples/Peripheral/ButtonLED/ButtonLED.ino
+++ b/examples/Peripheral/ButtonLED/ButtonLED.ino
@@ -72,7 +72,7 @@ void loop() {
   char buttonValue = digitalRead(buttonPin);
 
   // has the value changed since the last read
-  boolean buttonChanged = (buttonCharacteristic.value() != buttonValue);
+  bool buttonChanged = (buttonCharacteristic.value() != buttonValue);
 
   if (buttonChanged) {
     // button state changed, update characteristics
diff --git a/src/BLETypedCharacteristics.h b/src/BLETypedCharacteristics.h
index 465fc046..8bd98c78 100644
--- a/src/BLETypedCharacteristics.h
+++ b/src/BLETypedCharacteristics.h
@@ -27,7 +27,7 @@ class BLEBoolCharacteristic : public BLETypedCharacteristic<bool> {
   BLEBoolCharacteristic(const char* uuid, unsigned char properties);
 };
 
-class BLEBooleanCharacteristic : public BLETypedCharacteristic<boolean> {
+class BLEBooleanCharacteristic : public BLETypedCharacteristic<bool> {
 public:
   BLEBooleanCharacteristic(const char* uuid, unsigned char properties);
 };
diff --git a/src/utility/ATT.cpp b/src/utility/ATT.cpp
index 2696960e..6605a8a3 100644
--- a/src/utility/ATT.cpp
+++ b/src/utility/ATT.cpp
@@ -1142,7 +1142,7 @@ void ATTClass::readByTypeResp(uint16_t connectionHandle, uint8_t dlen, uint8_t d
 
 void ATTClass::writeReqOrCmd(uint16_t connectionHandle, uint16_t mtu, uint8_t op, uint8_t dlen, uint8_t data[])
 {
-  boolean withResponse = (op == ATT_OP_WRITE_REQ);
+  bool withResponse = (op == ATT_OP_WRITE_REQ);
 
   if (dlen < sizeof(uint16_t)) {
     if (withResponse) {