diff --git a/meta-security/meta-hardening/recipes-core/images/harden-image-minimal.bb b/meta-security/meta-hardening/recipes-core/images/harden-image-minimal.bb
index c35c257..38771cd 100644
--- a/meta-security/meta-hardening/recipes-core/images/harden-image-minimal.bb
+++ b/meta-security/meta-hardening/recipes-core/images/harden-image-minimal.bb
@@ -10,7 +10,8 @@
 
 IMAGE_ROOTFS_SIZE ?= "8192"
 
-inherit core-image extrausers
+inherit core-image
+IMAGE_CLASSES:append = " extrausers"
 
 ROOT_DEFAULT_PASSWORD ?= "1SimplePw!"
 DEFAULT_ADMIN_ACCOUNT ?= "myadmin"
@@ -19,7 +20,7 @@
 
 EXTRA_USERS_PARAMS = "${@bb.utils.contains('DISABLE_ROOT', 'True', "usermod -L root;", "usermod -P '${ROOT_DEFAULT_PASSWORD}' root;", d)}"
 
-EXTRA_USERS_PARAMS += "useradd  ${DEFAULT_ADMIN_ACCOUNT};" 
-EXTRA_USERS_PARAMS += "groupadd  ${DEFAULT_ADMIN_GROUP};" 
-EXTRA_USERS_PARAMS += "usermod -P '${DEFAULT_ADMIN_ACCOUNT_PASSWORD}' ${DEFAULT_ADMIN_ACCOUNT};" 
-EXTRA_USERS_PARAMS += "usermod -aG ${DEFAULT_ADMIN_GROUP}  ${DEFAULT_ADMIN_ACCOUNT};" 
+EXTRA_USERS_PARAMS:append = " useradd  ${DEFAULT_ADMIN_ACCOUNT};" 
+EXTRA_USERS_PARAMS:append = " groupadd  ${DEFAULT_ADMIN_GROUP};" 
+EXTRA_USERS_PARAMS:append = " usermod -P '${DEFAULT_ADMIN_ACCOUNT_PASSWORD}' ${DEFAULT_ADMIN_ACCOUNT};" 
+EXTRA_USERS_PARAMS:append = " usermod -aG ${DEFAULT_ADMIN_GROUP}  ${DEFAULT_ADMIN_ACCOUNT};"