diff --git a/.gitignore b/.gitignore
index 66d01465..9588c166 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,3 @@
-temp_dirs/undodir*
 sources_non_forked/ack.vim/.netrwhist
 temp_dirs/yankring_history_v2.txt
 sources_forked/yankring/doc/tags
diff --git a/temp_dirs/undodir/.gitignore b/temp_dirs/undodir/.gitignore
new file mode 100644
index 00000000..47e856eb
--- /dev/null
+++ b/temp_dirs/undodir/.gitignore
@@ -0,0 +1,2 @@
+# http://stackoverflow.com/a/932982
+!.gitignore