diff --git a/tests/bugs/core_1167_test.py b/tests/bugs/core_1167_test.py
index 3c7dcfe2..f8ee17b5 100644
--- a/tests/bugs/core_1167_test.py
+++ b/tests/bugs/core_1167_test.py
@@ -2,35 +2,75 @@
 
 """
 ID:          issue-1590
-ISSUE:       1590
+ISSUE:       https://github.com/FirebirdSQL/firebird/issues/1590
 TITLE:       CHARACTER SET GBK is not installed
 DESCRIPTION:
-  Default character set is GBK
-  Create Table T1(ID integer, FName Varchar(20); -- OK
-  Commit; ---Error Message: CHARACTER SET GBK is not installed
+    Default character set is GBK
+    Create Table T1(ID integer, FName Varchar(20); -- OK
+    Commit; ---Error Message: CHARACTER SET GBK is not installed
 JIRA:        CORE-1167
 FBTEST:      bugs.core_1167
+NOTES:
+    [05.10.2023] pzotov
+    Removed SHOW TABLE command for check result because its output often changes.
+    Query to RDB$ tables is used instead.
 """
 
 import pytest
 from firebird.qa import *
+import time
 
-db = db_factory(charset='GBK')
+db = db_factory(charset = 'GBK')
 
-test_script = """Create Table T1(ID integer, FName Varchar(20) CHARACTER SET GBK);
-COMMIT;
-SHOW TABLE T1;
+test_script = """
+    recreate table t1(
+        f1 varchar(20) character set gbk
+       ,f2 varchar(20) character set gbk collate gbk_unicode
+    );
+    commit;
+    set count on;
+    set list on;
+    select
+        rf.rdb$field_name as field_name
+        ,f.rdb$character_set_id as field_cset_id
+        ,f.rdb$collation_id as field_coll_id
+        ,f.rdb$character_length as field_cset_len
+        ,c.rdb$character_set_name as cset_name
+        ,k.rdb$collation_name as field_collation
+    from rdb$relation_fields rf
+    join rdb$fields f on rf.rdb$field_source = f.rdb$field_name
+    join rdb$character_sets c on f.rdb$character_set_id = c.rdb$character_set_id
+    left join rdb$collations k on c.rdb$character_set_id = k.rdb$character_set_id and f.rdb$collation_id = k.rdb$collation_id
+    where rf.rdb$relation_name = upper('T1')
+    order by
+         field_name
+        ,field_cset_id
+        ,field_coll_id
+    ;
 """
 
 act = isql_act('db', test_script)
 
-expected_stdout = """ID                              INTEGER Nullable
-FNAME                           VARCHAR(20) Nullable
+expected_stdout = """
+    FIELD_NAME                      F1
+    FIELD_CSET_ID                   67
+    FIELD_COLL_ID                   0
+    FIELD_CSET_LEN                  20
+    CSET_NAME                       GBK
+    FIELD_COLLATION                 GBK
+
+    FIELD_NAME                      F2
+    FIELD_CSET_ID                   67
+    FIELD_COLL_ID                   1
+    FIELD_CSET_LEN                  20
+    CSET_NAME                       GBK
+    FIELD_COLLATION                 GBK_UNICODE
+
+    Records affected: 2
 """
 
 @pytest.mark.version('>=3')
 def test_1(act: Action):
     act.expected_stdout = expected_stdout
-    act.execute()
+    act.execute(combine_output = True)
     assert act.clean_stdout == act.clean_expected_stdout
-