diff --git a/picampaign/importer/models.py b/picampaign/importer/models.py
index e874144b4d3f07814a54a1985cba80498bcfd75e..94c4f356bc2b219075b99658b61d25c5e984c02a 100644
--- a/picampaign/importer/models.py
+++ b/picampaign/importer/models.py
@@ -31,7 +31,7 @@ class Importer(models.Model):
     def kind(self):
         if self.url is None and self.file.name is None:
             return None
-        if self.url is not '':
+        if self.url is '':
             return 'url'
         else:
             return 'file'