diff --git a/src/conf/alsa.conf b/src/conf/alsa.conf
index a0716f96..449bdad3 100644
--- a/src/conf/alsa.conf
+++ b/src/conf/alsa.conf
@@ -317,7 +317,7 @@ ctl.default {
 }
 
 ctl.hw {
-	@args[ CARD ]
+	@args [ CARD ]
 	@args.CARD {
 		type string
 		default {