diff --git a/meta/classes/container-img.bbclass b/meta/classes/container-img.bbclass
index 79ef3e8..887d49e 100644
--- a/meta/classes/container-img.bbclass
+++ b/meta/classes/container-img.bbclass
@@ -6,6 +6,8 @@
 # This class provides the task 'containerize_rootfs'
 # to create container images containing the target rootfs.
 
+IMAGE_INSTALL += "isar-exclude-docs isar-disable-apt-cache"
+
 do_container_image[stamp-extra-info] = "${DISTRO}-${MACHINE}"
 do_container_image[vardeps] += "CONTAINER_FORMATS"
 do_container_image(){
diff --git a/meta/classes/image-container-extension.bbclass b/meta/classes/image-container-extension.bbclass
index f693627..e26604a 100644
--- a/meta/classes/image-container-extension.bbclass
+++ b/meta/classes/image-container-extension.bbclass
@@ -6,7 +6,6 @@
 # This class extends the image.bbclass for containerizing the root filesystem.
 
 CONTAINER_FORMATS ?= "docker-archive"
-IMAGE_INSTALL += "isar-exclude-docs isar-disable-apt-cache"
 
 containerize_rootfs() {
     local cmd="/bin/dash"