diff --git a/tests/bugs/gh_7133_test.py b/tests/bugs/gh_7133_test.py
new file mode 100644
index 00000000..da05210a
--- /dev/null
+++ b/tests/bugs/gh_7133_test.py
@@ -0,0 +1,56 @@
+#coding:utf-8
+
+"""
+ID:          issue-7133
+ISSUE:       7133
+TITLE:       Order by for big (>34 digits) int128 values is broken when index on that field is used.
+NOTES:
+    [23.02.2023] pzotov
+    Confirmed bug on 5.0.0.520
+    Checked on 5.0.0.958 - works fine.
+"""
+
+import pytest
+from firebird.qa import *
+
+db = db_factory()
+
+test_script = """
+    create table biTest(dat int128);
+    insert into biTest values(-170141183460469231731687303715884105726);
+    insert into biTest values(170141183460469231731687303715884105725);
+    insert into biTest values(170141183460469231731687303715884105727);
+    insert into biTest values(-170141183460469231731687303715884105728);
+    insert into biTest values(-170141183460469231731687303715884105727);
+    insert into biTest values(170141183460469231731687303715884105726);
+
+    insert into biTest values(12345678901234567890123456789012345678);
+    insert into biTest values(12345678901234567890123456789012345679);
+    insert into biTest values(12345678901234567890123456789012345677);
+    commit;
+    create index it on biTest(dat);
+    commit;
+
+    set heading off;
+    select dat from biTest order by dat;
+"""
+
+act = isql_act('db', test_script)
+
+expected_stdout = """
+    -170141183460469231731687303715884105728
+    -170141183460469231731687303715884105727
+    -170141183460469231731687303715884105726
+    12345678901234567890123456789012345677
+    12345678901234567890123456789012345678
+    12345678901234567890123456789012345679
+    170141183460469231731687303715884105725
+    170141183460469231731687303715884105726
+    170141183460469231731687303715884105727
+"""
+
+@pytest.mark.version('>=5.0')
+def test_1(act: Action):
+    act.expected_stdout = expected_stdout
+    act.execute(combine_output = True)
+    assert act.clean_stdout == act.clean_expected_stdout