diff --git a/manage b/manage
index 8b1975bd..bd89e7f2 100755
--- a/manage
+++ b/manage
@@ -37,7 +37,7 @@ PYLINT_SEARX_DISABLE_OPTION="\
 I,C,R,\
 W0105,W0212,W0511,W0603,W0613,W0621,W0702,W0703,W1401,\
 E1136"
-PYLINT_ADDITIONAL_BUILTINS_FOR_ENGINES="supported_languages,language_aliases,logger"
+PYLINT_ADDITIONAL_BUILTINS_FOR_ENGINES="supported_languages,language_aliases,logger,categories"
 PYLINT_OPTIONS="-m pylint -j 0 --rcfile .pylintrc"
 
 help() {
diff --git a/searx/engines/xpath.py b/searx/engines/xpath.py
index 3a8d32a6..a7a5e57a 100644
--- a/searx/engines/xpath.py
+++ b/searx/engines/xpath.py
@@ -184,7 +184,7 @@ def response(resp):
     '''
     results = []
     dom = html.fromstring(resp.text)
-    is_onion = 'onions' in categories  # pylint: disable=undefined-variable
+    is_onion = 'onions' in categories
 
     if results_xpath:
         for result in eval_xpath_list(dom, results_xpath):