Dan Jennings joined the Nationals front office this offseason, and the Marlins filed a grievance over his salary in D.C.. (AP Photo/Lynne Sladky)

VIERA, Fla. — The Miami Marlins filed a grievance with Major League Baseball this offseason over Dan Jennings’s salary with the Washington Nationals. That grievance was settled prior to spring training, and settled in the Nationals’ favor, according to a person familiar with the situation.

The Marlins made the unorthodox decision to move Dan Jennings from general manager to manager early in the 2015 season, then fired him after the season. Miami, where Jennings worked for 13 seasons in various capacities, owes him $1.5 million this year — or the difference between that amount and whatever another job pays him this season.

Several teams sought Jennings for front office positions this offseason, but he chose to join the Nationals as a special advisor to General Manager Mike Rizzo for $115,000 this season, according to a person familiar with the situation. That meant the Marlins must pay Jennings nearly $1.4 million. The more the Nationals paid Jennings, the less the Marlins would owe him.

In the grievance, first reported by the Miami Herald, the Marlins argued the Nationals were not paying Jennings enough — though a person familiar with the situation said that salary is commensurate with the salary earned by Nationals executives in similar positions.

“It’s an old grievance, and it has been settled,” Rizzo said. “That’s all the comment I have.”