diff --git a/src/misc.erl b/src/misc.erl
index 7599a1a34..fac3655cd 100644
--- a/src/misc.erl
+++ b/src/misc.erl
@@ -212,6 +212,8 @@ encode_base64(Data) ->
 -spec ip_to_list(inet:ip_address() | undefined |
                  {inet:ip_address(), inet:port_number()}) -> binary().
 
+ip_to_list({local, _}) ->
+    <<"unix">>;
 ip_to_list({IP, _Port}) ->
     ip_to_list(IP);
 %% This function clause could use inet_parse too: