diff --git a/tests/test_username.py b/tests/test_username.py
index d876b43..cbe1ca7 100644
--- a/tests/test_username.py
+++ b/tests/test_username.py
@@ -1,6 +1,18 @@
 """Tests for the username enumeration plugin."""
 
-from plugins.username import (
+import importlib.util
+import sys
+from pathlib import Path
+
+# plugins/ is not a Python package -- load the module from file path
+_spec = importlib.util.spec_from_file_location(
+    "plugins.username", Path(__file__).resolve().parent.parent / "plugins" / "username.py",
+)
+_mod = importlib.util.module_from_spec(_spec)
+sys.modules[_spec.name] = _mod
+_spec.loader.exec_module(_mod)
+
+from plugins.username import (  # noqa: E402
     _BY_CATEGORY,
     _BY_NAME,
     _SERVICES,