diff --git a/crawlab/routes/spiders.py b/crawlab/routes/spiders.py
index 91ab8608..a0a902da 100644
--- a/crawlab/routes/spiders.py
+++ b/crawlab/routes/spiders.py
@@ -509,7 +509,7 @@ class SpiderApi(BaseApi):
                    }, r.status_code
 
         # get html parse tree
-        sel = etree.HTML(r.content)
+        sel = etree.HTML(r.content.decode('utf-8'))
 
         # remove unnecessary tags
         unnecessary_tags = [