diff --git a/tests/testflows/ldap/authentication/tests/common.py b/tests/testflows/ldap/authentication/tests/common.py
index 1c662b3898b..0fd9670fae0 100644
--- a/tests/testflows/ldap/authentication/tests/common.py
+++ b/tests/testflows/ldap/authentication/tests/common.py
@@ -85,19 +85,29 @@ def add_config(config, timeout=60, restart=False):
     :param config: configuration file description
     :param timeout: timeout, default: 20 sec
     """
-    def check_preprocessed_config_is_updated():
+    def check_preprocessed_config_is_updated(after_removal=False):
         """Check that preprocessed config is updated.
         """
         started = time.time()
         command = f"cat /var/lib/clickhouse/preprocessed_configs/{config.preprocessed_name} | grep {config.uid}{' > /dev/null' if not settings.debug else ''}"
+
         while time.time() - started < timeout:
             exitcode = node.command(command, steps=False).exitcode
-            if exitcode == 0:
-                break
+            if after_removal:
+                if exitcode == 1:
+                    break
+            else:
+                if exitcode == 0:
+                    break
             time.sleep(1)
+
         if settings.debug:
             node.command(f"cat /var/lib/clickhouse/preprocessed_configs/{config.preprocessed_name}")
-        assert exitcode == 0, error()
+
+        if after_removal:
+            assert exitcode == 1, error()
+        else:
+            assert exitcode == 0, error()
 
     def wait_for_config_to_be_loaded():
         """Wait for config to be loaded.
@@ -160,7 +170,7 @@ def add_config(config, timeout=60, restart=False):
                     node.command(f"rm -rf {config.path}", exitcode=0)
 
                 with Then(f"{config.preprocessed_name} should be updated", description=f"timeout {timeout}"):
-                    check_preprocessed_config_is_updated()
+                    check_preprocessed_config_is_updated(after_removal=True)
 
                 with And("I wait for config to be reloaded"):
                     wait_for_config_to_be_loaded()