diff --git a/source/.gitignore b/source/.gitignore
index e140f210494ce8770fafd50e03cb1618b0ee3389..33cdba3f941695baa345091b3473a8b89241c40f 100644
--- a/source/.gitignore
+++ b/source/.gitignore
@@ -1,2 +1,3 @@
 tags
+tags.lock
 .x_*