On a day when the Light Blues paid tribute to legend Sandy Jardine by renaming the Govan Stand in his honour, it was to prove a poor day on the park in front of a bumper 43,000 crowd.
Ally McCoist's side started brightly at Ibrox but missed a host of chances in a decent first-half performance.
It was to cost them when former Gers star Danny Wilson headed home a corner to give the Jambos the lead.
With the clock ticking down, midfielder Nicky Law looked to have rescued a point right at the end for Rangers.
But, just seconds later, Osman Sow fired beyond Cammy Bell to send the large Jambos support wild and condemn Rangers to defeat.
A chorus of boos rung around Ibrox at the final whistle as the Light Blues got their campaign off to a poor start.