diff --git a/config/config.go b/config/config.go
index dda05b0cb..f9e4417e5 100644
--- a/config/config.go
+++ b/config/config.go
@@ -203,7 +203,7 @@ func (c *config) GetOfflineContentPath() string {
 	}
 
 	// This is relative to the webroot, not the project root.
-	return "static/offline.m4"
+	return "static/offline.m4v"
 }
 
 //Load tries to load the configuration file