diff --git a/common.sh b/common.sh
index eafbc928c1..cb7a35b1ee 100644
--- a/common.sh
+++ b/common.sh
@@ -426,6 +426,7 @@ BUILD_DIR=
 FLATCAR_DEVELOPER_CONTAINER_NAME="flatcar_developer_container.bin"
 FLATCAR_PRODUCTION_IMAGE_NAME="flatcar_production_image.bin"
 FLATCAR_PRODUCTION_IMAGE_PKGDB_NAME="flatcar_production_image_pkgdb.tar.xz"
+FLATCAR_PRODUCTION_IMAGE_SYSEXT_BASE="flatcar_production_image_sysext.squashfs"
 
 # -----------------------------------------------------------------------------
 # Functions