dribbler use of forearm

[psychobat]

I'm new to this board and have a question.
Situation: Last night I was officiating a jr high boys game and had a situation where one guard for one of the teams was using his forarm to keep the opponent from attacking his dribble. He never pushed off with the forearm but I saw it as an advantage for the offense so I called a player control foul on the dribbler? Was I correct in doing so? I know It is in the rule book somewhere but I can't seem to find it.
Thanks.