diff --git a/src/mod_admin_extra.erl b/src/mod_admin_extra.erl
index c23fd7818..8e9ea007f 100644
--- a/src/mod_admin_extra.erl
+++ b/src/mod_admin_extra.erl
@@ -1171,8 +1171,8 @@ subscribe_roster({Name, Server, Group, Nick}, [{Name, Server, _, _} | Roster]) -
     subscribe_roster({Name, Server, Group, Nick}, Roster);
 %% Subscribe Name2 to Name1
 subscribe_roster({Name1, Server1, Group1, Nick1}, [{Name2, Server2, Group2, Nick2} | Roster]) ->
-    subscribe(Name1, Server1, list_to_binary(Name2), list_to_binary(Server2),
-	list_to_binary(Nick2), list_to_binary(Group2), <<"both">>, []),
+    subscribe(Name1, Server1, iolist_to_binary(Name2), iolist_to_binary(Server2),
+	iolist_to_binary(Nick2), iolist_to_binary(Group2), <<"both">>, []),
     subscribe_roster({Name1, Server1, Group1, Nick1}, Roster).
 
 push_alltoall(S, G) ->