The beer will be a little light in flavor and in ABV but it will be okay though probably not impressive. But, you never know, you may like it. You won't reach the desired ABV.
On bottling day, substitute beer for water when boiling the priming sugar. This will be a small step toward correction of the minor error.
Note: Skip the secondary. Leave your beer for two or three weeks in the primary (original container) fermenter. Take a gravity reading two days apart (after the beer has been sitting two or three weeks). Make certain the readings are the same. If they're the same at that point, you're good to bottle.
If you like, report back to let us know how your beer turned out.
I'm reluctant, since you're probably new to brewing, to mention this but you could, if it's only been a day or two, add about 8oz of table sugar (boiled in a cup of beer and cooled) to the fermenter. This will hike the ABV a bit and close the gap.
Just make sure that anything that touches the beer has been rinsed with Starsan.