diff --git a/tests/conftest.py b/tests/conftest.py
index ae40096..c9ab549 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -40,7 +40,7 @@ def app():
 
 
 @pytest.fixture()
-def stable_langdetect(app):
+def _stable_langdetect(app):
     """Ensure that ``langdetect`` always returns the same thing.
 
     See: https://github.com/Mimino666/langdetect#basic-usage.
diff --git a/tests/test_hep_bd2xx.py b/tests/test_hep_bd2xx.py
index c5bbd57..63c26a6 100644
--- a/tests/test_hep_bd2xx.py
+++ b/tests/test_hep_bd2xx.py
@@ -22,6 +22,7 @@
 
 from __future__ import absolute_import, division, print_function
 
+import pytest
 from dojson.contrib.marc21.utils import create_record
 from inspire_schemas.api import load_schema, validate
 
@@ -175,8 +176,8 @@ def test_titles_from_245__a_b():
 
     assert expected == result['245']
 
-
-def test_title_translations_from_242__a(stable_langdetect):
+@pytest.mark.usefixtures(name='_stable_langdetect')
+def test_title_translations_from_242__a():
     schema = load_schema('hep')
     subschema = schema['properties']['title_translations']
 
@@ -206,8 +207,8 @@ def test_title_translations_from_242__a(stable_langdetect):
 
     assert expected == result['242']
 
-
-def test_title_translations_from_242__a_b(stable_langdetect):
+@pytest.mark.usefixtures(name='_stable_langdetect')
+def test_title_translations_from_242__a_b():
     schema = load_schema('hep')
     subschema = schema['properties']['title_translations']
 
diff --git a/tests/test_hep_bd5xx.py b/tests/test_hep_bd5xx.py
index b7cf13c..39701ef 100644
--- a/tests/test_hep_bd5xx.py
+++ b/tests/test_hep_bd5xx.py
@@ -325,7 +325,7 @@ def test_thesis_info_defense_date_from_500__a_incomplete_human_date():
     result = hep.do(create_record(snippet))
 
     assert validate(result['thesis_info'], subschema) is None
-    expected == result['thesis_info']
+    assert expected == result['thesis_info']
 
     expected = [
         {'a': 'Presented on 1992-12'},