Linfield's slim title hopes suffered a late blow at Windsor Park as Bobby Burns' 91st minute leveller rescued a point for Glentoran.
Sam Roscoe's first half header looked to have given the Blues a vital three points in their pursuit of league leaders Larne.
But the Glens cranked up the pressure in the closing stages and it told as Burns poked home a Ruaidhri Higgins' knockdown to leave David Healy's men nine points behind the Invermen with just three games left to play.
