diff --git a/cf_units/tests/integration/parse/test_graph.py b/cf_units/tests/integration/parse/test_graph.py
index 9743b8a0..fb1ad67f 100644
--- a/cf_units/tests/integration/parse/test_graph.py
+++ b/cf_units/tests/integration/parse/test_graph.py
@@ -2,6 +2,7 @@
 #
 # This file is part of cf-units and is released under the BSD license.
 # See LICENSE in the root of the repository for full licensing details.
+# ruff: noqa: E402
 import pytest
 
 antlr4 = pytest.importorskip("antlr4")
diff --git a/cf_units/tests/integration/parse/test_parse.py b/cf_units/tests/integration/parse/test_parse.py
index b76fadbf..5e91fd5b 100644
--- a/cf_units/tests/integration/parse/test_parse.py
+++ b/cf_units/tests/integration/parse/test_parse.py
@@ -2,6 +2,7 @@
 #
 # This file is part of cf-units and is released under the BSD license.
 # See LICENSE in the root of the repository for full licensing details.
+# ruff: noqa: E402
 import pytest
 
 antlr4 = pytest.importorskip("antlr4")
diff --git a/cf_units/tests/test_tex.py b/cf_units/tests/test_tex.py
index 966c887a..ffb91b6e 100644
--- a/cf_units/tests/test_tex.py
+++ b/cf_units/tests/test_tex.py
@@ -2,6 +2,7 @@
 #
 # This file is part of cf-units and is released under the BSD license.
 # See LICENSE in the root of the repository for full licensing details.
+# ruff: noqa: E402
 import pytest
 
 antlr4 = pytest.importorskip("antlr4")