diff --git a/setup.cfg b/setup.cfg
index 02259575..dfcbb748 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -91,6 +91,7 @@ ignore_missing_imports = True
 strict = True
 
 [coverage:run]
+source = build, tests
 omit =
     setup.py
     *bin/pyproject-build