diff --git a/tests/bugs/core_0857_test.py b/tests/bugs/core_0857_test.py
index a9938d86..47506058 100644
--- a/tests/bugs/core_0857_test.py
+++ b/tests/bugs/core_0857_test.py
@@ -9,7 +9,7 @@ JIRA:        CORE-857
 FBTEST:      bugs.core_0857
 NOTES:
     [31.10.2024] pzotov
-    Bug was fixed for too old FB (2.0 RC4 / 2.1 ALpha 1), firebird-driver and/or QA-plugin
+    Bug was fixed for too old FB (2.0 RC4 / 2.1 Alpha 1), firebird-driver and/or QA-plugin
     will not able to run on this version in order to reproduce problem.
 
     Checked on 6.0.0.511 (Windows/Linux); 5.0.2.1550;  4.0.6.3165; 3.0.2.32670, 3,0,1,32609
@@ -23,6 +23,7 @@ db = db_factory(charset='WIN1252')
 act = isql_act('db', substitutions=[('[ \\t]+', ' ')])
 tmp_sql = temp_file('tmp_core_0857.sql')
 
+@pytest.mark.intl
 @pytest.mark.version('>=3.0.0')
 def test_1(act: Action, tmp_sql: Path):
 
diff --git a/tests/bugs/core_1366_test.py b/tests/bugs/core_1366_test.py
index 1d53680d..7fa1c8d8 100644
--- a/tests/bugs/core_1366_test.py
+++ b/tests/bugs/core_1366_test.py
@@ -23,6 +23,7 @@ db = db_factory(charset='ISO8859_1')
 act = isql_act('db', substitutions=[('=.*', ''), ('[ \\t]+', ' ')])
 tmp_sql = temp_file('tmp_core_1366.sql')
 
+@pytest.mark.intl
 @pytest.mark.version('>=3.0.0')
 def test_1(act: Action, tmp_sql: Path):
 
diff --git a/tests/bugs/core_2227_test.py b/tests/bugs/core_2227_test.py
index 816b0853..da9e1b03 100644
--- a/tests/bugs/core_2227_test.py
+++ b/tests/bugs/core_2227_test.py
@@ -28,6 +28,7 @@ act = isql_act('db', substitutions = [ ('[ \\t]+', ' '), ('TCPv(4|6)', 'TCP') ])
 
 tmp_sql = temp_file('tmp_core_2227.sql')
 
+@pytest.mark.intl
 @pytest.mark.version('>=3.0.0')
 def test_1(act: Action, tmp_sql: Path):
     test_script = f"""
diff --git a/tests/bugs/core_3489_test.py b/tests/bugs/core_3489_test.py
index db620ff4..7cd10edf 100644
--- a/tests/bugs/core_3489_test.py
+++ b/tests/bugs/core_3489_test.py
@@ -47,6 +47,7 @@ expected_stdout = """
 
 tmp_sql = temp_file('tmp_core_3489.sql')
 
+@pytest.mark.intl
 @pytest.mark.version('>=3.0.0')
 def test_1(act: Action, tmp_sql: Path):
     tmp_sql.write_text(
diff --git a/tests/bugs/core_5464_test.py b/tests/bugs/core_5464_test.py
index 4f4593e5..8949a8c3 100644
--- a/tests/bugs/core_5464_test.py
+++ b/tests/bugs/core_5464_test.py
@@ -39,6 +39,7 @@ act = isql_act('db', substitutions = [('TCPv(4|6)', 'TCP')])
 
 tmp_sql = temp_file('tmp_core_5464.sql')
 
+@pytest.mark.intl
 @pytest.mark.version('>=3.0.1')
 def test_1(act: Action, tmp_sql: Path, capsys):