diff --git a/tests/functional/util/test_gbak_zip.py b/tests/functional/util/test_gbak_zip.py
index e6ae52be..c45c63aa 100644
--- a/tests/functional/util/test_gbak_zip.py
+++ b/tests/functional/util/test_gbak_zip.py
@@ -26,6 +26,9 @@ NOTES:
     2. Test performs TWO iterations for b/r + validation: without and with '-se localhost:service_mgr'.
 
     Checked on 5.0.0.623, 4.0.1.2692 - both on Windows and Linux.
+
+    [25.11.2023] pzotov
+    Writing code requires more care since 6.0.0.150: ISQL does not allow specifying duplicate delimiters without any statements between them (two semicolon, two carets etc).
 """
 import locale
 import re
@@ -50,7 +53,7 @@ non_ascii_ddl = '''
      set echo on;
 
      create collation "Циферки" for utf8 from unicode case insensitive 'NUMERIC-SORT=1';
-     create collation "Испания" for iso8859_1 from es_es_ci_ai 'SPECIALS-FIRST=1';;
+     create collation "Испания" for iso8859_1 from es_es_ci_ai 'SPECIALS-FIRST=1';
      commit;
 
      create domain "ИД'шники" int;
@@ -188,7 +191,7 @@ tmp_file = temp_file('non_ascii_ddl.sql')
 def test_1(act: Action, act_res: Action, tmp_fbk: Path, tmp_res: Database, tmp_file: Path, capsys):
 
     tmp_file.write_bytes(non_ascii_ddl.encode('utf-8'))
-    act.isql(switches=['-q'], input_file=tmp_file, charset='utf8', io_enc = 'utf-8')
+    act.isql(switches=['-q'], input_file=tmp_file, charset='utf8', io_enc = 'utf-8', combine_output = True)
     assert act.clean_stdout.endswith('Metadata created OK.')
     act.reset()