diff --git a/configure-searxng-safesearch.sh b/configure-searxng-safesearch.sh
index ad0ea00..7080d7c 100755
--- a/configure-searxng-safesearch.sh
+++ b/configure-searxng-safesearch.sh
@@ -190,6 +190,10 @@ set -u
   printf 'general:\n  instance_name: "Local Search"\n'
   printf 'server:\n  secret_key: "%s"\n  limiter: false\n' "$SECRET_KEY"
   printf 'search:\n  safe_search: %d\n  default_lang: "en"\n  formats: [html, json]\n' "$SAFE_INT"
+  # Lock the safe-search preference so users cannot override it via the UI
+  if [[ "$LEVEL" != "none" ]]; then
+    printf 'preferences:\n  lock:\n    - safesearch\n'
+  fi
   if [[ -n "$ENGINE_BLOCK" ]]; then
     printf 'engines:\n'
     printf '%b' "$ENGINE_BLOCK"