diff --git a/src/MIDI.hpp b/src/MIDI.hpp
index 12d0019..232f401 100644
--- a/src/MIDI.hpp
+++ b/src/MIDI.hpp
@@ -34,6 +34,11 @@ BEGIN_MIDI_NAMESPACE
 template<class SerialPort, class Settings>
 inline MidiInterface<SerialPort, Settings>::MidiInterface(SerialPort& inSerial)
     : mSerial(inSerial)
+    , mInputChannel(0)
+    , mRunningStatus_RX(InvalidType)
+    , mRunningStatus_TX(InvalidType)
+    , mPendingMessageExpectedLenght(0)
+    , mPendingMessageIndex(0)
 {
     mNoteOffCallback                = 0;
     mNoteOnCallback                 = 0;