diff --git a/roles/opendkim/files/opendkim.conf b/roles/opendkim/files/opendkim.conf
index c50d1d1692..2997cbe6ce 100644
--- a/roles/opendkim/files/opendkim.conf
+++ b/roles/opendkim/files/opendkim.conf
@@ -134,4 +134,4 @@ OversignHeaders	From
 #
 # We need to increase the default header size because notifs adds a X-fedmsg header for
 # each message in a digest.
-MaximumHeaders 262144
+MaximumHeaders 1024288