diff --git a/live-build/auto/config b/live-build/auto/config
index 1b3dd4ad..272d940d 100755
--- a/live-build/auto/config
+++ b/live-build/auto/config
@@ -343,9 +343,6 @@ if [ -z "${IMAGEFORMAT:-}" ]; then
 					;;
 			esac
 			;;
-		ubuntu-base:*)
-			IMAGEFORMAT=ubuntu-image
-			;;
 		ubuntu-server:live|ubuntu-mini-iso:)
 			IMAGEFORMAT=plain
 			;;