diff --git a/pyproject.toml b/pyproject.toml
index a281102..5413614 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -99,3 +99,9 @@ exclude_lines = [
   "pragma: no cover",
   "raise NotImplementedError()",
 ]
+
+[tool.coverage.paths]
+source = [
+  "src/",
+  ".tox/**/site-packages/",
+]