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Recent reforms to the Canadian Senate removed senators from the Liberal Party caucus and changed the appointment process to be more nonpartisan. This article asks: to what extent did the reforms affect legislative oversight in the Senate? By studying the Senate's legislative amendments, I find that the reformed Senate is more willing to amend bills than it was previously. The reforms led to sharp increases in the Senate's amendment rate, the number of amendments moved and the percentage of successful motions in amendment. In interviews, senators revealed that they see oversight differently following the reforms. Senators no longer have opportunities to advise the government in caucus, so they have begun using amendments to exercise oversight. This article concludes that the reforms shifted senators’ understanding of their function of oversight, leading to a higher amendment rate and increased visible scrutiny of government by the Senate.