diff --git a/tests/conftest.py b/tests/conftest.py
index ad01645b..0ad58b9d 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -126,18 +126,6 @@ def _get_tag(schema):
     return None
 
 
-@pytest.fixture(scope="session")
-def tag_to_schema(schemas):
-    result = {}
-    for schema in schemas:
-        tag = _get_tag(schema)
-        if tag is not None:
-            if tag not in result:
-                result[tag] = []
-            result[tag].append(schema)
-    return result
-
-
 @pytest.fixture(scope="session")
 def id_to_schema(schemas):
     result = {}
@@ -150,7 +138,7 @@ def id_to_schema(schemas):
 
 
 @pytest.fixture(scope="session")
-def assert_schema_correct(tag_to_schema, id_to_schema):
+def assert_schema_correct(id_to_schema):
     def _assert_schema_correct(path):
         __tracebackhide__ = True
 
@@ -180,9 +168,6 @@ def _assert_schema_correct(path):
 
         assert len(id_to_schema[schema["id"]]) == 1, f"{path.name} does not have a unique id"
 
-        if "tag" in schema:
-            assert len(tag_to_schema[schema["tag"]]) == 1, f"{path.name} does not have a unique tag"
-
         id_base, _ = split_id(schema["id"])
         for example_id in list_example_ids(schema):
             example_id_base, _ = split_id(example_id)
diff --git a/tests/test_manifests.py b/tests/test_manifests.py
index 1226b5b0..eca08b62 100644
--- a/tests/test_manifests.py
+++ b/tests/test_manifests.py
@@ -8,7 +8,7 @@
 
 
 @pytest.mark.parametrize("path", MANIFEST_PATHS)
-def test_manifest(path, tag_to_schema):
+def test_manifest(path):
     manifest = load_yaml(path)
 
     with asdf.config_context() as config: