diff --git a/.hgignore b/.hgignore
index 99fc8d87c..b3df24f47 100644
--- a/.hgignore
+++ b/.hgignore
@@ -3,6 +3,7 @@
 .*\.so
 build/
 dist/
+tests/.coverage
 sphinx/pycode/Grammar.*pickle
 Sphinx.egg-info/
 doc/_build/