diff --git a/CHANGELOG.md b/CHANGELOG.md
index cda764e..19ae0d6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 ### Added
 
 ### Changed
+- Fixed a bug where randomization logic was being applied even when no random seed was provided (#31)
 
 ### Removed
 
diff --git a/pytest_test_groups/__init__.py b/pytest_test_groups/__init__.py
index 94c9fee..d913a9c 100644
--- a/pytest_test_groups/__init__.py
+++ b/pytest_test_groups/__init__.py
@@ -8,20 +8,24 @@
 # Import 3rd-party libs
 from _pytest.config import create_terminal_writer
 
+
 class StrEnum(str, Enum):
     """Custom StrEnum for Python < 3.11 compatibility."""
     def __str__(self):
         return self.value
-    
+
+
 class GroupBy(StrEnum):
     DEFAULT = ""
     FILENAME = "filename"
 
+
 def get_group_default(items, group_count, group_id):
     """Get the items from the passed in group based on group count."""
     start = _get_start(group_id, group_count)
     return items[start:len(items):group_count]
 
+
 def get_group_by_filename(items, group_count, group_id):
     """Get the items from the passed in group, split by files, based on group count."""
     start = _get_start(group_id, group_count)
@@ -45,16 +49,19 @@ def get_group_by_filename(items, group_count, group_id):
 
     return group_to_items[start]
 
+
 def _get_start(group_id, group_count):
     if not (1 <= group_id <= group_count):
         raise pytest.UsageError('Invalid test-group argument')
     return group_id - 1
 
+
 groupByHandlers = {
     GroupBy.DEFAULT: get_group_default,
     GroupBy.FILENAME: get_group_by_filename
 }
 
+
 def pytest_addoption(parser):
     group = parser.getgroup('split your tests into groups and run them')
     group.addoption('--test-group-count', dest='test-group-count', type=int,
@@ -71,20 +78,21 @@ def _sort_in_original_order(items, orig_items):
     items.sort(key=original_order.__getitem__)
     return items
 
+
 @pytest.hookimpl(hookwrapper=True)
 def pytest_collection_modifyitems(session, config, items):
     yield
     group_count = config.getoption('test-group-count')
     group_id = config.getoption('test-group')
     group_by = config.getoption("test-group-by")
-    seed = config.getoption('random-seed', False)
+    seed = config.getoption('random-seed')
 
     if not group_count or not group_id:
         return
-    
+
     original_items = items[:]
 
-    if seed is not False:
+    if seed is not None:
         seeded = Random(seed)
         seeded.shuffle(items)
 
@@ -94,7 +102,7 @@ def pytest_collection_modifyitems(session, config, items):
     if len(items) == 0:
         raise pytest.UsageError('Invalid test-group argument')
 
-    if seed is not False:
+    if seed is not None:
         items = _sort_in_original_order(items, original_items)
 
     terminal_reporter = config.pluginmanager.get_plugin('terminalreporter')
diff --git a/tests/test_pytest.py b/tests/test_pytest.py
index 0ed704b..ab645a2 100644
--- a/tests/test_pytest.py
+++ b/tests/test_pytest.py
@@ -72,6 +72,7 @@ def test_z(): pass
 
     assert set(group_1 + group_2) == set(all_tests)
 
+
 def test_group_by_files(testdir):
     testdir.makepyfile(test_file_1="""
         def test_a(): pass
@@ -161,6 +162,7 @@ def test_e(): pass
     )
     result.assertoutcome(passed=5)
 
+
 def test_group_runs_after_std_item_collection(testdir):
     """If @pytest.hookimpl(hookwrapper=True) is not used, the plugin will split the item
     list of items before other filtering (like -k) has been applied. This could potentially
@@ -180,6 +182,7 @@ def test_y(): pass
     result = testdir.runpytest_subprocess('-k', 'test_y', '--test-group-count', '2', '--test-group', '2')
     assert 'Invalid test-group argument' in result.stderr.str()
 
+
 def test_random_group_runs_in_original_order(testdir):
     """When running tests with a random seed, check test order is unchanged"""
     testdir.makepyfile("""
@@ -197,4 +200,4 @@ def test_b(): pass
                                 '--test-group', '1',
                                 '--test-group-random-seed', '5')
     group_1 = [x.item.name for x in result.calls if x._name == 'pytest_runtest_call']
-    assert group_1 == sorted(group_1, reverse=True)
\ No newline at end of file
+    assert group_1 == sorted(group_1, reverse=True)