diff --git a/live-build/auto/config b/live-build/auto/config
index 593b921b..dac739e6 100755
--- a/live-build/auto/config
+++ b/live-build/auto/config
@@ -716,7 +716,7 @@ case $PROJECT in
 			*)
 				touch config/universe-enabled
 				KERNEL_FLAVOURS='generic-hwe-22.04'
-				if [ "$SUBARCH" = "X13s" ]; then
+				if [ "$SUBARCH" = "x13s" ]; then
 					KERNEL_FLAVOURS='laptop-23.10'
 				fi
 				PASSES_TO_LAYERS="true"