diff --git a/.hgignore b/.hgignore
index d6ff6f86d..c105a355b 100644
--- a/.hgignore
+++ b/.hgignore
@@ -15,5 +15,6 @@ __pycache__/
 ^src/s3ql/deltadump.c$
 ^src/s3ql\.egg-info$
 ^tests/.cache/
+^tests/.pytest_cache/
 ^tests/test.log$
 ^tests/test_crit.log$