diff --git a/.coveragerc b/.coveragerc
index bc5980d78f1b957c4e99ecc53e54a5779d76baba..fd274e8e4c9e77af5ae5158216fb11c5bf959f4a 100644
--- a/.coveragerc
+++ b/.coveragerc
@@ -1,6 +1,6 @@
 [run]
 omit =
-    tests/*
+    tests/*.py
     setup.py
     csst_common/ccds/*.py
     csst_common/dfs.py