diff --git a/src/MIDI.cpp b/src/MIDI.cpp
index c223443..f776846 100644
--- a/src/MIDI.cpp
+++ b/src/MIDI.cpp
@@ -33,6 +33,7 @@
                                            MIDI_SOFTSERIAL_TX_PIN);
 #       else
 #           error Todo: implement SoftwareSerial for avr core.
+#       endif
 #       undef  MIDI_SERIAL_PORT
 #       define MIDI_SERIAL_PORT softSerialClass
 #   else
diff --git a/src/midi_Inline.hpp b/src/midi_Inline.hpp
index 9b01df1..f26c3c8 100644
--- a/src/midi_Inline.hpp
+++ b/src/midi_Inline.hpp
@@ -143,14 +143,14 @@ void MidiInterface::sendSysEx(unsigned int inLength,
     {
         MIDI_SERIAL_PORT.write(0xF0);
         
-        for (int i=0;i<inLength;++i)
+        for (unsigned int i=0;i<inLength;++i)
             MIDI_SERIAL_PORT.write(inArray[i]);
         
         MIDI_SERIAL_PORT.write(0xF7);
     }
     else
     {
-        for (int i=0;i<inLength;++i)
+        for (unsigned int i=0;i<inLength;++i)
             MIDI_SERIAL_PORT.write(inArray[i]);
     }