diff --git a/Core/HLE/sceVaudio.cpp b/Core/HLE/sceVaudio.cpp
index 82f7eeba46..e6cb7e0e20 100644
--- a/Core/HLE/sceVaudio.cpp
+++ b/Core/HLE/sceVaudio.cpp
@@ -48,7 +48,7 @@ u32 sceVaudioChReserve(int sampleCount, int freq, int format) {
 	DEBUG_LOG(HLE, "sceVaudioChReserve(%i, %i, %i)", sampleCount, freq, format);
 	chans[PSP_AUDIO_CHANNEL_VAUDIO].reserved = true;
 	chans[PSP_AUDIO_CHANNEL_VAUDIO].sampleCount = sampleCount;
-	chans[PSP_AUDIO_CHANNEL_VAUDIO].format = format;
+	chans[PSP_AUDIO_CHANNEL_VAUDIO].format = format == 2 ? PSP_AUDIO_FORMAT_STEREO : PSP_AUDIO_FORMAT_MONO;
 	chans[PSP_AUDIO_CHANNEL_VAUDIO].leftVolume = 0;
 	chans[PSP_AUDIO_CHANNEL_VAUDIO].rightVolume = 0;
 	vaudioReserved = true;