diff --git a/big_tests/tests/vcard_simple_SUITE.erl b/big_tests/tests/vcard_simple_SUITE.erl
index 55f5e5a1f8..080d1cfa3c 100644
--- a/big_tests/tests/vcard_simple_SUITE.erl
+++ b/big_tests/tests/vcard_simple_SUITE.erl
@@ -458,8 +458,7 @@ ldap_opts() ->
                  base => <<"ou=Users,dc=esl,dc=com">>,
                  search_fields => [{"Full Name", "cn"}, {"User", "uid"}],
                  vcard_map => [{"FN", "%s", ["cn"]}]},
-    DefaultLDAPOpts = config_parser_helper:default_config([modules, mod_vcard, ldap]),
-    LDAPOptsWithDefaults = maps:merge(DefaultLDAPOpts, LDAPOpts),
+    LDAPOptsWithDefaults = config_parser_helper:config([modules, mod_vcard, ldap], LDAPOpts),
     config_parser_helper:mod_config(mod_vcard, #{backend => ldap, ldap => LDAPOptsWithDefaults}).
 
 ensure_started(HostType, Opts) ->
diff --git a/src/config/mongoose_config_spec.erl b/src/config/mongoose_config_spec.erl
index 96cc6ee5e3..18cf5ae4a3 100644
--- a/src/config/mongoose_config_spec.erl
+++ b/src/config/mongoose_config_spec.erl
@@ -633,8 +633,8 @@ outgoing_pool_connection(<<"ldap">>) ->
                 },
        format_items = map,
        include = always,
-       defaults = #{<<"rootdn">> => <<"">>,
-                    <<"password">> => <<"">>,
+       defaults = #{<<"rootdn">> => <<>>,
+                    <<"password">> => <<>>,
                     <<"encrypt">> => none,
                     <<"servers">> => ["localhost"],
                     <<"connect_interval">> => 10000}
diff --git a/src/mod_shared_roster_ldap.erl b/src/mod_shared_roster_ldap.erl
index 774fd935b8..ffac8d703d 100644
--- a/src/mod_shared_roster_ldap.erl
+++ b/src/mod_shared_roster_ldap.erl
@@ -131,15 +131,15 @@ config_spec() ->
                  <<"useruid">> => <<"cn">>,
                  <<"memberattr">> => <<"memberUid">>,
                  <<"memberattr_format">> => <<"%u">>,
-                 <<"memberattr_format_re">> => <<"">>,
+                 <<"memberattr_format_re">> => <<>>,
                  <<"auth_check">> => true,
                  <<"user_cache_validity">> => ?USER_CACHE_VALIDITY,
                  <<"group_cache_validity">> => ?GROUP_CACHE_VALIDITY,
                  <<"user_cache_size">> => ?CACHE_SIZE,
                  <<"group_cache_size">> => ?CACHE_SIZE,
-                 <<"rfilter">> => <<"">>,
-                 <<"gfilter">> => <<"">>,
-                 <<"ufilter">> => <<"">>},
+                 <<"rfilter">> => <<>>,
+                 <<"gfilter">> => <<>>,
+                 <<"ufilter">> => <<>>},
     CommonLDAPSpec#section{items = maps:merge(CommonLDAPSpec#section.items, Items),
                            defaults = maps:merge(CommonLDAPSpec#section.defaults, Defaults),
                            process = fun process_ldap_options/1}.
@@ -533,7 +533,7 @@ parse_options(Host, #{base := Base, pool_tag := EldapID, deref := Deref, filter
     SubFilter = <<"(&(", UIDAttr/binary, "=", UIDAttrFormat/binary,
                   ")(", GroupAttr/binary, "=%g))">>,
     UIDAttrFormatRe = case UIDAttrFormatReIn of
-                          <<"">> -> UIDAttrFormatReIn;
+                          <<>> -> UIDAttrFormatReIn;
                           RE ->
                               {ok, MP} = re:compile(RE),
                               MP
@@ -579,7 +579,7 @@ parse_options(Host, #{base := Base, pool_tag := EldapID, deref := Deref, filter
            group_cache_size = GroupCacheSize,
            group_cache_validity = GroupCacheValidity}.
 
-check_filter(<<"">>) -> <<"">>;
+check_filter(<<>>) -> <<>>;
 check_filter(F) ->
     {ok, _} = eldap_filter:parse(F),
     F.
diff --git a/src/mongoose_ldap_config.erl b/src/mongoose_ldap_config.erl
index 9d2af430bf..e1daab6e84 100644
--- a/src/mongoose_ldap_config.erl
+++ b/src/mongoose_ldap_config.erl
@@ -23,7 +23,7 @@ spec() ->
                   <<"filter">> => #option{type = binary}},
         defaults = #{<<"pool_tag">> => default,
                      <<"deref">> => never,
-                     <<"filter">> => <<"">>},
+                     <<"filter">> => <<>>},
         format_items = map
     }.