diff --git a/Elisp.gitignore b/Elisp.gitignore
index 89a7597718fd51387a3514f81e588851f1c0fbd6..25f2b431a6d058f8138c88ad0333bab1d7a3b3a7 100644
--- a/Elisp.gitignore
+++ b/Elisp.gitignore
@@ -5,4 +5,7 @@
 .cask
 
 # Backup files
-*~
\ No newline at end of file
+*~
+
+# Undo-tree save-files
+*.~undo-tree
\ No newline at end of file