diff --git a/src/conf/pcm/surround21.conf b/src/conf/pcm/surround21.conf
index be29020f..7f4676b3 100644
--- a/src/conf/pcm/surround21.conf
+++ b/src/conf/pcm/surround21.conf
@@ -51,10 +51,9 @@ pcm.!surround21 {
 			]
 		}
 	}
-	slave.channels 6
-	ttable.0.0 1
-	ttable.1.1 1
-	ttable.2.5 1
+	ttable.0.FL 1
+	ttable.1.FR 1
+	ttable.2.LFE 1
 	hint {
 		description "2.1 Surround output to Front and Subwoofer speakers"
 		device $DEV