diff --git a/longs/tables.py b/longs/tables.py
index 014e2b6b..4f261c1a 100755
--- a/longs/tables.py
+++ b/longs/tables.py
@@ -15,7 +15,7 @@ class LongImageColumn(tables.Column):
         blocks =[]
         for obj in value.all():
             blocks.append(obj.get_block())
-        return format_html("<span class='multi-image-block'>{}</span>", "".join(blocks))
+        return format_html("<span class='multi-image-block'>{}</span>".format("".join(blocks)))
 
         obj = value.first()