diff --git a/projects/RPi/filesystem/usr/share/alsa/cards/vc4-hdmi.conf b/projects/RPi/filesystem/usr/share/alsa/cards/vc4-hdmi.conf
index dc1e477a35..9b1c1d688a 100644
--- a/projects/RPi/filesystem/usr/share/alsa/cards/vc4-hdmi.conf
+++ b/projects/RPi/filesystem/usr/share/alsa/cards/vc4-hdmi.conf
@@ -35,6 +35,7 @@ vc4-hdmi.pcm.hdmi.0 {
 				hook_args [
 				{
 					name "IEC958 Playback Default"
+					interface PCM
 					optional true
 					lock true
 					preserve true