Kean's initial deal was due to run until June 2014 but he has now extended his stay at Rovers until the summer of 2016.
A club statement read: "Blackburn Rovers are pleased to announce that goalkeeper Jake Kean has committed his future to the club."
"The highly-rated England Under-20 international has signed a two-year extension to his current contract, which will keep him at Ewood Park until June 2016.
"He has been Rovers' second-choice keeper for every Championship fixture this season and is relishing a return to Pride Park this weekend."
Kean signed from Blackburn's opponents on Saturday, Derby County, three years ago.