Viewers certainly tuned in to watch Jay Leno’s return to late night on Monday, but will it last? The Tonight Show with Jay Leno swamped longtime rival David Letterman in the ratings on Monday, pulling in nearly twice as many viewers as The Late Show.

In his opening monologue Thursday night, Jay Leno addressed rumors about The Jay Leno Show being cancelled by NBC. Leno joked about calling Katie Couric to see how her move from NBC to another network is working out for her.

NBC has no plans to cancel The Jay Leno Show despite failing ratings, according to a statement from the network. NBC issued a response to rumors of a cancellation on Thursday, saying the network is hoping to improve the show to garner more ratings.