diff --git a/searx/engines/bing.py b/searx/engines/bing.py
index 9712a3103..88b097289 100644
--- a/searx/engines/bing.py
+++ b/searx/engines/bing.py
@@ -27,7 +27,6 @@ def request(query, params):
 
 
 def response(resp):
-    global base_url
     results = []
     dom = html.fromstring(resp.content)
     for result in dom.xpath('//div[@class="sa_cc"]'):
diff --git a/searx/engines/bing_news.py b/searx/engines/bing_news.py
index 5b48a5450..56c6f1208 100644
--- a/searx/engines/bing_news.py
+++ b/searx/engines/bing_news.py
@@ -29,7 +29,6 @@ def request(query, params):
 
 
 def response(resp):
-    global base_url
     results = []
     dom = html.fromstring(resp.content)
     for result in dom.xpath('//div[@class="sa_cc"]'):
diff --git a/searx/engines/currency_convert.py b/searx/engines/currency_convert.py
index ce6b3b854..561527bce 100644
--- a/searx/engines/currency_convert.py
+++ b/searx/engines/currency_convert.py
@@ -31,7 +31,6 @@ def request(query, params):
 
 
 def response(resp):
-    global base_url
     results = []
     try:
         _, conversion_rate, _ = resp.text.split(',', 2)
diff --git a/searx/engines/deviantart.py b/searx/engines/deviantart.py
index d42a25a19..298b9a397 100644
--- a/searx/engines/deviantart.py
+++ b/searx/engines/deviantart.py
@@ -18,7 +18,6 @@ def request(query, params):
 
 
 def response(resp):
-    global base_url
     results = []
     if resp.status_code == 302:
         return results
diff --git a/searx/engines/github.py b/searx/engines/github.py
index be2cfe7c5..d36797aba 100644
--- a/searx/engines/github.py
+++ b/searx/engines/github.py
@@ -10,7 +10,6 @@ accept_header = 'application/vnd.github.preview.text-match+json'
 
 
 def request(query, params):
-    global search_url
     params['url'] = search_url.format(query=urlencode({'q': query}))
     params['headers']['Accept'] = accept_header
     return params
diff --git a/searx/engines/soundcloud.py b/searx/engines/soundcloud.py
index e28fb1600..07cdbc273 100644
--- a/searx/engines/soundcloud.py
+++ b/searx/engines/soundcloud.py
@@ -18,7 +18,6 @@ def request(query, params):
 
 
 def response(resp):
-    global base_url
     results = []
     search_res = loads(resp.text)
     for result in search_res.get('collection', []):
diff --git a/searx/engines/twitter.py b/searx/engines/twitter.py
index 23393ac4d..c05c20fc2 100644
--- a/searx/engines/twitter.py
+++ b/searx/engines/twitter.py
@@ -12,13 +12,11 @@ content_xpath = './/p[@class="js-tweet-text tweet-text"]//text()'
 
 
 def request(query, params):
-    global search_url
     params['url'] = search_url + urlencode({'q': query})
     return params
 
 
 def response(resp):
-    global base_url
     results = []
     dom = html.fromstring(resp.text)
     for tweet in dom.xpath('//li[@data-item-type="tweet"]'):