diff --git a/weboob/applications/boobmsg/boobmsg.py b/weboob/applications/boobmsg/boobmsg.py
index d489d9e7..e6414184 100644
--- a/weboob/applications/boobmsg/boobmsg.py
+++ b/weboob/applications/boobmsg/boobmsg.py
@@ -76,7 +76,7 @@ class MessageFormatter(IFormatter):
             else:
                 signature = item['signature']
 
-            result += '\n-- \n%s' % item['signature']
+            result += '\n-- \n%s' % signature
         return result