diff --git a/tests/testflows/kerberos/configs/clickhouse1/config.d/kerberos.xml b/tests/testflows/kerberos/configs/clickhouse1/config.d/kerberos.xml
index ceaa497c561..e45c4519c73 100644
--- a/tests/testflows/kerberos/configs/clickhouse1/config.d/kerberos.xml
+++ b/tests/testflows/kerberos/configs/clickhouse1/config.d/kerberos.xml
@@ -1,5 +1,6 @@
+<?xml version='1.0' encoding='utf8'?>
 <yandex>
     <kerberos>
         <realm>EXAMPLE.COM</realm>
     </kerberos>
-</yandex>
\ No newline at end of file
+</yandex>
diff --git a/tests/testflows/kerberos/tests/common.py b/tests/testflows/kerberos/tests/common.py
index e19ce2fc60e..0366cbc237f 100644
--- a/tests/testflows/kerberos/tests/common.py
+++ b/tests/testflows/kerberos/tests/common.py
@@ -170,7 +170,7 @@ def check_wrong_config(self, node, client, config_path, modify_file, log_error="
             config_contents = xmltree.tostring(root, encoding='utf8', method='xml').decode('utf-8')
             command = f"cat <<HEREDOC > {full_config_path}\n{config_contents}\nHEREDOC"
             node.command(command, steps=False, exitcode=0)
-            # time.sleep(1)
+            time.sleep(1)
 
         with Then(f"{preprocessed_name} should be updated", description=f"timeout {timeout}"):
             started = time.time()
@@ -183,6 +183,7 @@ def check_wrong_config(self, node, client, config_path, modify_file, log_error="
             assert exitcode == 0, error()
 
         with When("I restart ClickHouse to apply the config changes"):
+            node.cmd("kdestroy")
             if output:
                 node.restart(safe=False, wait_healthy=True)
             else:
@@ -201,7 +202,7 @@ def check_wrong_config(self, node, client, config_path, modify_file, log_error="
                         break
                     time.sleep(1)
                 else:
-                    assert False, error()
+                    assert output in r.output, error()
 
     finally:
         with Finally("I restore original config"):