diff --git a/meta-evb/meta-evb-aspeed/meta-evb-ast2500/conf/local.conf.sample b/meta-evb/meta-evb-aspeed/meta-evb-ast2500/conf/local.conf.sample
index 5f8b6c5..18ac0f8 100644
--- a/meta-evb/meta-evb-aspeed/meta-evb-ast2500/conf/local.conf.sample
+++ b/meta-evb/meta-evb-aspeed/meta-evb-ast2500/conf/local.conf.sample
@@ -1,11 +1,11 @@
 MACHINE ??= "evb-ast2500"
 DISTRO ?= "openbmc-phosphor"
 PACKAGE_CLASSES ?= "package_rpm"
-SANITY_TESTED_DISTROS_append ?= " *"
-EXTRA_IMAGE_FEATURES = "debug-tweaks"
-USER_CLASSES ?= "buildstats image-prelink"
+SANITY_TESTED_DISTROS:append ?= " *"
+EXTRA_IMAGE_FEATURES ?= "debug-tweaks"
+USER_CLASSES ?= "buildstats"
 PATCHRESOLVE = "noop"
-BB_DISKMON_DIRS = "\
+BB_DISKMON_DIRS ??= "\
     STOPTASKS,${TMPDIR},1G,100K \
     STOPTASKS,${DL_DIR},1G,100K \
     STOPTASKS,${SSTATE_DIR},1G,100K \