diff --git a/.gitignore b/.gitignore
index dff4c7568..80d0b5197 100644
--- a/.gitignore
+++ b/.gitignore
@@ -54,3 +54,4 @@ tools/simplebench
 /templates
 hledger-web/static/tmp/
 hledger-web/yesod-devel/
+.hledger-web_client_session_key.aes