diff --git a/weboob/backends/aum/pages/contact_list.py b/weboob/backends/aum/pages/contact_list.py
index ba5277f2..f07b718e 100644
--- a/weboob/backends/aum/pages/contact_list.py
+++ b/weboob/backends/aum/pages/contact_list.py
@@ -111,7 +111,7 @@ class ContactItem:
 
         text = tag.getAttribute('onclick')
 
-        regexp = re.compile("window.location='/thread.php\?id=(.*)'")
+        regexp = re.compile("window.location='/thread.php\?id=(\d+)'")
         m = regexp.match(text)
 
         if m: