diff --git a/src/conf/pcm/default.conf b/src/conf/pcm/default.conf
index 738d632c..fcee2989 100644
--- a/src/conf/pcm/default.conf
+++ b/src/conf/pcm/default.conf
@@ -34,6 +34,9 @@ pcm.!default {
 	default {
 		# use plughw as default
 		type plug
-		slave.pcm hw
+		slave.pcm {
+			type hw
+			card $CARD
+		}
 	}
 }