Ross County manager Derek Adams was "devastated" by the decision to award Inverness the penalty which won the Highland derby.
Mihael Kovacevic's challenge on Charlie Taylor resulted in a spot-kick and
Billy McKay converted to give the hosts a 2-1 victory.
"Hugely disappointed to lose a derby match," Adams told BBC Scotland.
"I think a draw would've been fair but they've managed to win with a major decision going against us."
Adams reviewed the action after a tempestuous match and thought the challenge from Kovacevic had been "well timed".
"I've seen it on the television and [it was] never a penalty kick," insisted the County boss.
"It's another time we've played against Inverness and they've got a major decision in the game go for them; twice in the Scottish Cup, two offside goals, and today a penalty that never was.
"I don't think Inverness will be happy with winning a match in that way."
The result brought the Dingwall side's 11-match unbeaten run to an end and dropped them below Inverness into fourth place in the Scottish Premier League.
However, County remain well placed for a European place for next season.
"We've been on a terrific run, we've got the longest unbeaten run in the Premier League this season and we're proud of that," he added.
"We've got a wee break now [with international matches next weekend] and we've put ourselves in a fabulous position this season."
Meanwhile, Adams offered no comment when asked about the upcoming vacancy at
Aberdeen, whose manager Craig Brown will be stepping down in the summer.