diff --git a/.gitignore b/.gitignore
index 1dc12fcc4..5e0f8882f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -23,6 +23,7 @@
 /tmp/sessions/*
 /tmp/sockets/*
 /tmp/test/*
+/tmp/thumbnails/*
 /vendor/cache
 /vendor/rails
 *.rbc
diff --git a/.hgignore b/.hgignore
index cd27d0a6b..9fde48651 100644
--- a/.hgignore
+++ b/.hgignore
@@ -25,6 +25,7 @@ tmp/pdf/*
 tmp/sessions/*
 tmp/sockets/*
 tmp/test/*
+tmp/thumbnails/*
 vendor/cache
 vendor/rails
 *.rbc