diff --git a/apps/emqx_auth_ldap/test/emqx_auth_ldap_SUITE.erl b/apps/emqx_auth_ldap/test/emqx_auth_ldap_SUITE.erl
index 5de24d913..8bf7d532b 100644
--- a/apps/emqx_auth_ldap/test/emqx_auth_ldap_SUITE.erl
+++ b/apps/emqx_auth_ldap/test/emqx_auth_ldap_SUITE.erl
@@ -48,7 +48,9 @@ init_per_group(GrpName, Cfg) ->
     Cfg.
 
 end_per_group(_GrpName, _Cfg) ->
-    emqx_ct_helpers:stop_apps([emqx_auth_ldap]).
+    emqx_ct_helpers:stop_apps([emqx_auth_ldap]),
+    %% clear the application envs to avoid cross-suite testcase failure
+    application:unload(emqx_auth_ldap).
 
 %%--------------------------------------------------------------------
 %% Cases
diff --git a/apps/emqx_auth_ldap/test/emqx_auth_ldap_bind_as_user_SUITE.erl b/apps/emqx_auth_ldap/test/emqx_auth_ldap_bind_as_user_SUITE.erl
index 4f56ab32a..99f733d78 100644
--- a/apps/emqx_auth_ldap/test/emqx_auth_ldap_bind_as_user_SUITE.erl
+++ b/apps/emqx_auth_ldap/test/emqx_auth_ldap_bind_as_user_SUITE.erl
@@ -40,7 +40,9 @@ init_per_suite(Config) ->
     Config.
 
 end_per_suite(_Config) ->
-    emqx_ct_helpers:stop_apps([emqx_auth_ldap]).
+    emqx_ct_helpers:stop_apps([emqx_auth_ldap]),
+    %% clear the application envs to avoid cross-suite testcase failure
+    application:unload(emqx_auth_ldap).
 
 check_auth(_) ->
     MqttUser1 = #{clientid => <<"mqttuser1">>,