diff --git a/mod_admin_extra/src/mod_admin_extra.erl b/mod_admin_extra/src/mod_admin_extra.erl
index 109fd66..2591769 100644
--- a/mod_admin_extra/src/mod_admin_extra.erl
+++ b/mod_admin_extra/src/mod_admin_extra.erl
@@ -166,7 +166,7 @@ commands() ->
      #ejabberd_commands{name = num_active_users, tags = [accounts, stats],
 			desc = "Get number of users active in the last days",
 			module = ?MODULE, function = num_active_users,
-			args = [{host, string}, {days, integer}],
+			args = [{host, binary}, {days, integer}],
 			result = {users, integer}},
      #ejabberd_commands{name = delete_old_users, tags = [accounts, purge],
 			desc = "Delete users that didn't log in last days, or that never logged",
@@ -176,24 +176,24 @@ commands() ->
      #ejabberd_commands{name = delete_old_users_vhost, tags = [accounts, purge],
 			desc = "Delete users that didn't log in last days in vhost, or that never logged",
 			module = ?MODULE, function = delete_old_users_vhost,
-			args = [{host, string}, {days, integer}],
+			args = [{host, binary}, {days, integer}],
 			result = {res, restuple}},
 
      #ejabberd_commands{name = check_account, tags = [accounts],
 			desc = "Check if an account exists or not",
 			module = ejabberd_auth, function = is_user_exists,
-			args = [{user, string}, {host, string}],
+			args = [{user, binary}, {host, binary}],
 			result = {res, rescode}},
      #ejabberd_commands{name = check_password, tags = [accounts],
 			desc = "Check if a password is correct",
 			module = ejabberd_auth, function = check_password,
-			args = [{user, string}, {host, string}, {password, string}],
+			args = [{user, binary}, {host, binary}, {password, binary}],
 			result = {res, rescode}},
      #ejabberd_commands{name = check_password_hash, tags = [accounts],
 			desc = "Check if the password hash is correct",
 			longdesc = "Allowed hash methods: md5, sha.",
 			module = ?MODULE, function = check_password_hash,
-			args = [{user, string}, {host, string}, {passwordhash, string}, {hashmethod, string}],
+			args = [{user, binary}, {host, binary}, {passwordhash, binary}, {hashmethod, binary}],
 			result = {res, rescode}},
      #ejabberd_commands{name = change_password, tags = [accounts],
 			desc = "Change the password of an account",
@@ -203,18 +203,18 @@ commands() ->
      #ejabberd_commands{name = ban_account, tags = [accounts],
 			desc = "Ban an account: kick sessions and set random password",
 			module = ?MODULE, function = ban_account,
-			args = [{user, string}, {host, string}, {reason, string}],
+			args = [{user, binary}, {host, binary}, {reason, binary}],
 			result = {res, rescode}},
 
      #ejabberd_commands{name = num_resources, tags = [session],
 			desc = "Get the number of resources of a user",
 			module = ?MODULE, function = num_resources,
-			args = [{user, string}, {host, string}],
+			args = [{user, binary}, {host, binary}],
 			result = {resources, integer}},
      #ejabberd_commands{name = resource_num, tags = [session],
 			desc = "Resource string of a session number",
 			module = ?MODULE, function = resource_num,
-			args = [{user, string}, {host, string}, {num, integer}],
+			args = [{user, binary}, {host, binary}, {num, integer}],
 			result = {resource, string}},
      #ejabberd_commands{name = kick_session, tags = [session],
 			desc = "Kick a user session",
@@ -442,7 +442,7 @@ commands() ->
 			longdesc = "Timestamp is the seconds since"
 			"1970-01-01 00:00:00 UTC, for example: date +%s",
 			module = ?MODULE, function = get_last,
-			args = [{user, string}, {host, string}],
+			args = [{user, binary}, {host, binary}],
 			result = {last_activity, string}},
      #ejabberd_commands{name = set_last, tags = [last],
 			desc = "Set last activity information",