diff --git a/src/BLECharacteristic.h b/src/BLECharacteristic.h
index da9721e0..8c42f47e 100644
--- a/src/BLECharacteristic.h
+++ b/src/BLECharacteristic.h
@@ -37,7 +37,12 @@ enum BLECharacteristicEvent {
 class BLECharacteristic;
 class BLEDevice;
 
+#ifdef ARDUINO_ARCH_MBED
+#include <mbed.h>
+typedef mbed::Callback<void (BLEDevice device, BLECharacteristic characteristic)> BLECharacteristicEventHandler;
+#else
 typedef void (*BLECharacteristicEventHandler)(BLEDevice device, BLECharacteristic characteristic);
+#endif
 
 class BLELocalCharacteristic;
 class BLERemoteCharacteristic;
diff --git a/src/BLEDevice.h b/src/BLEDevice.h
index bf710744..cf3bc0d4 100644
--- a/src/BLEDevice.h
+++ b/src/BLEDevice.h
@@ -34,7 +34,12 @@ enum BLEDeviceEvent {
 
 class BLEDevice;
 
+#ifdef ARDUINO_ARCH_MBED
+#include <mbed.h>
+typedef mbed::Callback<void (BLEDevice device)> BLEDeviceEventHandler;
+#else
 typedef void (*BLEDeviceEventHandler)(BLEDevice device);
+#endif
 
 class BLEDevice {
 public: