diff --git a/pythonlib/camoufox/utils.py b/pythonlib/camoufox/utils.py
index 317bb0b..5b125ef 100644
--- a/pythonlib/camoufox/utils.py
+++ b/pythonlib/camoufox/utils.py
@@ -1038,7 +1038,7 @@ def launch_options(
         # User passed a custom fingerprint
         if not i_know_what_im_doing:
             check_custom_fingerprint(fingerprint)
-    elif fingerprint_preset is not None:
+    elif fingerprint_preset:
         # User opted into real fingerprint presets
         if isinstance(fingerprint_preset, dict):
             preset = fingerprint_preset
diff --git a/pythonlib/tests/test_identity_salt.py b/pythonlib/tests/test_identity_salt.py
index f63ef7a..f371cea 100644
--- a/pythonlib/tests/test_identity_salt.py
+++ b/pythonlib/tests/test_identity_salt.py
@@ -162,3 +162,11 @@ class TestPrefsEnvIsAscii:
         joined = "".join(env[f"CAMOU_PREFS_{i}"] for i in range(1, len(env) + 1))
         assert joined.isascii()
         assert orjson.loads(joined) == prefs
+
+
+@pytest.mark.parametrize("off", [None, False])
+def test_fingerprint_preset_off_never_draws_a_preset(off):
+    """`fingerprint_preset=False` means off, the same as None. It used to be
+    checked with `is not None`, so False drew a random bundled preset."""
+    with mock.patch.object(utils, "get_random_preset", side_effect=AssertionError("preset drawn")):
+        launch(fingerprint_preset=off)