diff --git a/longs/models.py b/longs/models.py
index 19d9cfd1..2d4f85de 100644
--- a/longs/models.py
+++ b/longs/models.py
@@ -289,7 +289,7 @@ class LongSeries(models.Model):
         images = self.images.all()
 
         filenames = []
-        map = []
+        map = {}
 
         for i in images:
             filenames.append((i, i.upload_filename))