diff --git a/bin/v-add-mail-domain-dkim b/bin/v-add-mail-domain-dkim
index a775e2bfe..c5b6fbdeb 100755
--- a/bin/v-add-mail-domain-dkim
+++ b/bin/v-add-mail-domain-dkim
@@ -14,7 +14,7 @@ user=$1
 domain=$(idn -t --quiet -u "$2" )
 domain=$(echo $domain | tr '[:upper:]' '[:lower:]')
 domain_idn=$(idn -t --quiet -a "$domain")
-dkim_size=${3-512}
+dkim_size=${3-1024}
 
 # Includes
 source $VESTA/conf/vesta.conf