diff --git a/pyproject.toml b/pyproject.toml
index 9c7d16a..c60b9ff 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,7 +12,7 @@ authors = [
 ]
 
 [tool.pytest.ini_options]
-pythonpath = "."
+pythonpath = ["."]
 python_files = [
   "test_*.py",
   "tests.py",