diff --git a/sync.sh b/sync.sh
index dd4cbd2..fa3ab34 100644
--- a/sync.sh
+++ b/sync.sh
@@ -19,10 +19,11 @@ function main() {
    local action="$1"
    shift
    case "$action" in
-      clean ) clean_remote --prune "$@"   ;;
-      backup ) backup "$@"                ;;
-      restore ) restore "$@"              ;;
-      * )      RESTIC "$action" "$@"      ;;
+      clean ) clean_remote --prune "$@"         ;;
+      backup ) backup "$@"                      ;;
+      restore ) restore "$@"                    ;;
+      forget ) fatal "Refusing custom forget"   ;;
+      * )      RESTIC "$action" "$@"            ;;
    esac
 }