diff --git a/packages/rocketchat-file/file.server.coffee b/packages/rocketchat-file/file.server.coffee
index 926a2aad3515158c44b5ee32134cd0771370a958..00aa21319db99271c07db37013a2836cf57b02d1 100644
--- a/packages/rocketchat-file/file.server.coffee
+++ b/packages/rocketchat-file/file.server.coffee
@@ -5,6 +5,9 @@ path = Npm.require('path')
 mkdirp = Npm.require('mkdirp')
 gm = Npm.require('gm')
 
+# Fix problem with usernames being converted to object id
+Grid.prototype.tryParseObjectId = -> false
+
 RocketChatFile =
 	gm: gm