diff --git a/Umbraco.gitignore b/Umbraco.gitignore
index b6b0743f62a5074621a5b002582cc27c8c3cf0f8..c039262671ed5ed8db152556f156c6863e7a1b35 100644
--- a/Umbraco.gitignore
+++ b/Umbraco.gitignore
@@ -21,3 +21,6 @@
 
 # ImageProcessor DiskCache 
 **/App_Data/cache/
+
+# Ignore the Models Builder models out of date flag
+**/App_Data/Models/ood.flag