diff --git a/src/conf/cards/EMU10K1.conf b/src/conf/cards/EMU10K1.conf
index 7a7ebf54..956e1636 100644
--- a/src/conf/cards/EMU10K1.conf
+++ b/src/conf/cards/EMU10K1.conf
@@ -108,6 +108,7 @@ EMU10K1.pcm.center_lfe.0 {
 				index 1
 				preserve true
 				# lock true
+				optional true
 				value true
 			}
 			{
@@ -115,6 +116,7 @@ EMU10K1.pcm.center_lfe.0 {
 				index 1
 				preserve true
 				# lock true
+				optional true
 				value true
 			}
 # if you have a creative's digital receiver, you can get surround/center/lfe