diff --git a/Global/Emacs.gitignore b/Global/Emacs.gitignore
index d40e8659..489b8928 100644
--- a/Global/Emacs.gitignore
+++ b/Global/Emacs.gitignore
@@ -47,3 +47,5 @@ flycheck_*.el
 # network security
 /network-security.data
 
+# undo-tree
+*.~undo-tree~