diff --git a/Include/Acidanthera/Protocol/AudioIo.h b/Include/Acidanthera/Protocol/AudioIo.h
index 9f59169715d..2f660310893 100644
--- a/Include/Acidanthera/Protocol/AudioIo.h
+++ b/Include/Acidanthera/Protocol/AudioIo.h
@@ -37,7 +37,7 @@
 
 typedef struct EFI_AUDIO_IO_PROTOCOL_ EFI_AUDIO_IO_PROTOCOL;
 
-#define EFI_AUDIO_IO_PROTOCOL_REVISION 1
+#define EFI_AUDIO_IO_PROTOCOL_REVISION 2
 
 /**
   Port type.