How to unset SHELLOPTS monitor:notify?

I like getting notified immediately when a background process exits. To do that one uses: $ set -b When you do that, it sets the shell option, contained in the BUILTIN variable SHELLOPTS, called "monitor"; it changes from just "monitor" to "monitor:notify". But what if I want to return it to the default status of only giving notification when the shell is about to issue a new prompt? I tried unset with the following result: $ unset -b bash: unset: -b: invalid option unset: usage: unset [-f] [-v] [-n] [name ...] It obviously doesn't work! I dug through the BASH man page and looked under the shopt command but didn't find anything that addressed this, but then perhaps I didn't recognize what I was looking for.