diff --git a/rpcs3/Emu/Io/RB3MidiGuitar.h b/rpcs3/Emu/Io/RB3MidiGuitar.h
index 3dbc712541..3a93f95d61 100644
--- a/rpcs3/Emu/Io/RB3MidiGuitar.h
+++ b/rpcs3/Emu/Io/RB3MidiGuitar.h
@@ -7,7 +7,7 @@
 class usb_device_rb3_midi_guitar : public usb_device_emulated
 {
 private:
-	u32 response_pos = 0;
+	usz response_pos = 0;
 	bool buttons_enabled = false;
 	RtMidiInPtr midi_in{};
 
diff --git a/rpcs3/Emu/Io/RB3MidiKeyboard.h b/rpcs3/Emu/Io/RB3MidiKeyboard.h
index 13fb63f5a1..c5042af239 100644
--- a/rpcs3/Emu/Io/RB3MidiKeyboard.h
+++ b/rpcs3/Emu/Io/RB3MidiKeyboard.h
@@ -7,7 +7,7 @@
 class usb_device_rb3_midi_keyboard : public usb_device_emulated
 {
 private:
-	u32 response_pos = 0;
+	usz response_pos = 0;
 	bool buttons_enabled = false;
 	RtMidiInPtr midi_in{};