diff --git a/searx/engines/youtube.py b/searx/engines/youtube.py
index 265f86af8..1331f480e 100644
--- a/searx/engines/youtube.py
+++ b/searx/engines/youtube.py
@@ -27,7 +27,7 @@ def response(resp):
         title = result['title']['$t']
         content = ''
         if len(result['media$group']['media$thumbnail']):
-            content += '
' % (result['media$group']['media$thumbnail'][0]['url'])
+            content += '
'.format(url, result['media$group']['media$thumbnail'][0]['url'])
         if len(content):
             content += '
' + result['content']['$t']
         else: