Unity Greeter does not tile background images.

I have a background image set as a tile. It's a small image that get repeated across the screen.
The unity greeter loads the image sucessfully when I choose my nickname in the welcome screen but fails to tile the image stretching it to fit the screen which leads to an awful welcome screen.
It should tile the image so it looks the same as my background.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: unity-greeter 0.2.7-0ubuntu2 [modified: usr/share/glib-2.0/schemas/com.canonical.unity-greeter.gschema.xml]
ProcVersionSignature: Ubuntu 3.2.0-20.33-generic 3.2.12
Uname: Linux 3.2.0-20-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.0-0ubuntu4
Architecture: amd64
Date: Tue Apr 10 01:43:22 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120328)
SourcePackage: unity-greeter
UpgradeStatus: No upgrade log present (probably fresh install)