diff --git a/bootstrap_sdk b/bootstrap_sdk
index 9bfbe92c77..12c6014b7d 100755
--- a/bootstrap_sdk
+++ b/bootstrap_sdk
@@ -40,8 +40,6 @@ TYPE="flatcar-sdk"
 # include upload options
 . "${BUILD_LIBRARY_DIR}/release_util.sh" || exit 1
 
-ROOT_OVERLAY=${TEMPDIR}/stage4_overlay
-
 ## Define the stage4 config template
 catalyst_stage4() {
 cat <<EOF
@@ -63,6 +61,7 @@ export GENTOO_MIRRORS
 
 catalyst_init "$@"
 check_gsutil_opts
+ROOT_OVERLAY=${TEMPDIR}/stage4_overlay
 
 if [[ "$STAGES" =~ stage4 ]]; then
     info "Setting release to ${FLATCAR_VERSION}"
diff --git a/build_toolchains b/build_toolchains
index 85c09001a9..4168c01a10 100755
--- a/build_toolchains
+++ b/build_toolchains
@@ -15,8 +15,6 @@ FORCE_STAGES="stage4"
 # include upload options
 . "${BUILD_LIBRARY_DIR}/release_util.sh" || exit 1
 
-ROOT_OVERLAY="${TEMPDIR}/stage4-${ARCH}-$FLAGS_version-overlay"
-
 ## Define the stage4 config template
 catalyst_stage4() {
 cat <<EOF
@@ -32,6 +30,8 @@ catalyst_stage_default
 catalyst_init "$@"
 check_gsutil_opts
 
+ROOT_OVERLAY="${TEMPDIR}/stage4-${ARCH}-$FLAGS_version-overlay"
+
 # toolchain_util.sh is required by catalyst_toolchains.sh
 mkdir -p "${ROOT_OVERLAY}/tmp"
 cp "${BUILD_LIBRARY_DIR}/toolchain_util.sh" "${ROOT_OVERLAY}/tmp"