diff --git a/src/conf/cards/CS46xx.conf b/src/conf/cards/CS46xx.conf
index 074d1137..36b616b5 100644
--- a/src/conf/cards/CS46xx.conf
+++ b/src/conf/cards/CS46xx.conf
@@ -197,11 +197,22 @@ CS46xx.pcm.iec958.0 {
 				value 1
 			}
 			{
+				interface PCM
+				name "IEC958 Playback PCM Stream"
+				device 2
+				lock true
+				preserve true
+				optional true
+				value [ $AES0 $AES1 $AES2 $AES3 ]
+			}
+			{
+				# for compatibility with older drivers
 				interface PCM
 				name "IEC958 Playback PCM Stream"
 				device 0
 				lock true
 				preserve true
+				optional true
 				value [ $AES0 $AES1 $AES2 $AES3 ]
 			}
 		]