diff --git a/system_setup/install.sh b/system_setup/install.sh
index 849f2bb..67dcab5 100755
--- a/system_setup/install.sh
+++ b/system_setup/install.sh
@@ -360,7 +360,7 @@ if [[ -n "$EXISTING_OEMDRV_DEV" ]]; then
             mount -o "$MOUNT_OPTS" "$EXISTING_OEMDRV_DEV" "$MOUNT_POINT" || die "mount failed."
         fi
 
-        if [[ -f "$MOUNT_POINT/system_setup/setup_system.inc.sh" ]]; then
+        if [[ -f "$MOUNT_POINT/system_setup/setup_system.inc.sh" && -f "$MOUNT_POINT/config/setup_system.conf" ]]; then
             info "Sourcing existing setup_system.inc.sh..."
             pushd "$MOUNT_POINT/system_setup" > /dev/null
             source setup_system.inc.sh