diff --git a/recipes/insider.recipe b/recipes/insider.recipe
index 4bfe0511cc..a29bce02f9 100644
--- a/recipes/insider.recipe
+++ b/recipes/insider.recipe
@@ -29,7 +29,7 @@ class insider(BasicNewsRecipe):
         br['login-password'] = self.password
         res = br.submit()
         raw = res.read()
-        if b'Odhlásit se' not in raw:
+        if u'Odhlásit se'.encode('utf-8') not in raw:
             raise ValueError('Failed to login to insider.cz'
                              'Check your username and password.')
         return br