Help with supplemental au jus for prime rib roast?

[brandnewuser]

I'll be making a prime rib roast for Christmas eve dinner and I'm afraid I won't have enough drippings for my au jus. Can anyone share any tips or product tips to help stretch it out? Thanks!

[mpalmer6c]

There may be better ideas, but I'd just add some beef broth. The drippings should still give it plenty of flavor. (This is what I do for turkey gravy.)