diff --git a/.gitignore b/.gitignore
index 87b1739dcd..89a3a0dc89 100644
--- a/.gitignore
+++ b/.gitignore
@@ -22,6 +22,7 @@ resources/template-functions.json
 resources/editor-functions.json
 resources/user-manual-translation-stats.json
 resources/editor.js
+resources/viewer.js
 resources/content-server/index-generated.html
 resources/content-server/calibre.appcache
 resources/content-server/locales.zip