diff --git a/extract-files.sh b/extract-files.sh
index a5acc73..125e280 100755
--- a/extract-files.sh
+++ b/extract-files.sh
@@ -1,8 +1,7 @@
 #!/bin/bash
 #
-# Copyright (C) 2016 The CyanogenMod Project
-# Copyright (C) 2017-2020 The LineageOS Project
-#
+# SPDX-FileCopyrightText: 2016 The CyanogenMod Project
+# SPDX-FileCopyrightText: 2017-2024 The LineageOS Project
 # SPDX-License-Identifier: Apache-2.0
 #
 
@@ -17,5 +16,6 @@ set -e
 export DEVICE=kebab
 export DEVICE_COMMON=sm8250-common
 export VENDOR=oneplus
+export VENDOR_COMMON=${VENDOR}
 
-"./../../${VENDOR}/${DEVICE_COMMON}/extract-files.sh" "$@"
+"./../../${VENDOR_COMMON}/${DEVICE_COMMON}/extract-files.sh" "$@"
diff --git a/setup-makefiles.sh b/setup-makefiles.sh
index aea170c..64ccc78 100755
--- a/setup-makefiles.sh
+++ b/setup-makefiles.sh
@@ -1,15 +1,21 @@
 #!/bin/bash
 #
-# Copyright (C) 2016 The CyanogenMod Project
-# Copyright (C) 2017-2020 The LineageOS Project
-#
+# SPDX-FileCopyrightText: 2016 The CyanogenMod Project
+# SPDX-FileCopyrightText: 2017-2024 The LineageOS Project
 # SPDX-License-Identifier: Apache-2.0
 #
 
+# If we're being sourced by the common script that we called,
+# stop right here. No need to go down the rabbit hole.
+if [ "${BASH_SOURCE[0]}" != "${0}" ]; then
+    return
+fi
+
 set -e
 
 export DEVICE=kebab
 export DEVICE_COMMON=sm8250-common
 export VENDOR=oneplus
+export VENDOR_COMMON=${VENDOR}
 
-"./../../${VENDOR}/${DEVICE_COMMON}/setup-makefiles.sh" "$@"
+"./../../${VENDOR_COMMON}/${DEVICE_COMMON}/setup-makefiles.sh" "$@"