diff --git a/src/core/MidiIO.cpp b/src/core/MidiIO.cpp
index 6dde85c2..8ca37b32 100644
--- a/src/core/MidiIO.cpp
+++ b/src/core/MidiIO.cpp
@@ -167,6 +167,7 @@ void MidiIO::close() {
 	if (mw->idMessagesMap.size() == 0) {
 		mw->closePort();
 		midiInMap.erase(deviceName);
+		delete (mw);
 	}
 
 	id = -1;