diff --git a/swh/lister/debian/models.py b/swh/lister/debian/models.py
index 3cba2f8..1a7058f 100644
--- a/swh/lister/debian/models.py
+++ b/swh/lister/debian/models.py
@@ -85,11 +85,11 @@ class Area(SQLBase):
                     yield (base_uri + '.' + ext, ext)
                 else:
                     yield (base_uri, None)
-
-        raise NotImplementedError(
-            'Do not know how to build index URI for Distribution type %s' %
-            self.distribution.type
-        )
+        else:
+            raise NotImplementedError(
+                'Do not know how to build index URI for Distribution type %s' %
+                self.distribution.type
+            )
 
     def __repr__(self):
         return 'Area(%s of %s)' % (