diff --git a/lib/configfiles/wheezy.xml b/lib/configfiles/wheezy.xml
index 42fec383..36150cd9 100644
--- a/lib/configfiles/wheezy.xml
+++ b/lib/configfiles/wheezy.xml
@@ -3318,6 +3318,7 @@ service auth {
   unix_listener auth-client {
     mode = 0660
     user = mail
+    group = Debian-exim
   }
 
   # Auth process is run as this user.