diff --git a/conf/install_update_dovecot.conf.sample b/conf/install_update_dovecot.conf.sample
index 12e4028..ddd6875 100644
--- a/conf/install_update_dovecot.conf.sample
+++ b/conf/install_update_dovecot.conf.sample
@@ -53,12 +53,19 @@ ipv6=""
 # ---
 # - Listener configuration
 # ---
+if [[ -n "$ipv6" ]]; then
+   imap_listener_adresses="127.0.0.1 $ipv4 $ipv6"
+   imaps_listener_adresses="$ipv4 $ipv6"
 
-imap_listener_adresses="127.0.0.1 $ipv4 $ipv6"
-imaps_listener_adresses="$ipv4 $ipv6"
+   pop_listener_adresses="$ipv4 $ipv6"
+   pops_listener_adresses="$ipv4 $ipv6"
+else
+   imap_listener_adresses="127.0.0.1 $ipv4"
+   imaps_listener_adresses="$ipv4"
 
-pop_listener_adresses="$ipv4 $ipv6"
-pops_listener_adresses="$ipv4 $ipv6"
+   pop_listener_adresses="$ipv4"
+   pops_listener_adresses="$ipv4"
+fi
 
 xmpp_listener=false
 xmpp_listener_address="127.0.0.1"