Kenwood HU issue?

[Greggors91VTS]

Hey guys, last night i pulled my HU out to sort so wires in the back of it and when i put it back in, the facia which you can take of, will no longer clip back into place, I'm not sure why (it seems that the catch on the HU does not have any spring init or something??) has anyone had this problem before or know how to fix it? Or am i just buying a new HU lol?
Its a Kenwood KDC W60 i think