diff --git a/live-build/auto/build b/live-build/auto/build
index 60f32dd4..3c26818c 100755
--- a/live-build/auto/build
+++ b/live-build/auto/build
@@ -56,8 +56,8 @@ if [ "${IMAGEFORMAT:-}" = "ubuntu-image" ]; then
 		#  we should be supporting more than one for models that
 		#  define those.
 		mv output/*.img "$PREFIX".img
-		# For appliance images we also need to generate qcow2 images.
-		case "${SUBARCH:-}" in appliance-*)
+		# For amd64 appliance images we also need to generate qcow2 images.
+		case "${SUBARCH:-}" in appliance-*-amd64)
 			convert_to_qcow2 "$PREFIX".img "$PREFIX".qcow2 ;;
 		esac
 		# Now regular, compressed images.