If you’re Christmas list included a crossover of “Sherlock” and “Doctor Who,” you may be disappointed by our next story.

Steven Moffat, who produces both shows, says that he’s asked about a potential crossover a lot by fans, but that he doesn’t see it happening.

“I think everyone who’s passing me in the streets is suggesting that at the moment. I think there are problems of doing that, because then you would say that Sherlock Holmes lives in the same world as the Doctor, and there are Daleks and all sorts of things. If a Sherlock Holmes story depends on time travel being impossible, it’s quite hard if he’s a personal friend of the Doctor’s, isn’t it?,” Moffat tells the New York Times.

So, it appears that a crossover is off the table for now, except in the realms of fan fic.

The Doctor has run across Holmes in the New Adventures story, “All Consuming Fire.” The novel is out of print and may be difficult to find, however.