diff --git a/extensions/ufs.sh b/extensions/ufs.sh
index 78aad28e3..ac5c6a45b 100644
--- a/extensions/ufs.sh
+++ b/extensions/ufs.sh
@@ -1,4 +1,5 @@
 # Create UFS aligned image (requires >= Debian 13 (Trixie) Host)
+declare -g DOCKER_ARMBIAN_BASE_IMAGE=debian:trixie
 function extension_prepare_config__ufs {
     # Check sfdisk version is >= 2.41 for UFS support
     local sfdisk_version
@@ -15,4 +16,4 @@ function extension_prepare_config__ufs {
     fi
     EXTRA_IMAGE_SUFFIXES+=("-ufs")
     declare -g SECTOR_SIZE=4096
-}
\ No newline at end of file
+}