Danica McKellar may have trouble performing to the best of her ability in next Monday night's performance show.

The 39-year-old actress and former The Wonder Years star injured herself while practicing her upcoming Dancing with the Stars routine with her professional partner Val Chmerkovskiy on Thursday.

"So...I broke a rib in yesterday's #DWTS rehearsal. Trying my best to pull thru and could use your prayers!! #wanttokeepdancing," McKellar tweeted on Friday.

McKellar's representative declined comment on the injury.

Last week, McKellar and Chmerkovskiy tied for third place on the judges' leaderboard with Sochi Olympics ice dancing gold medalist Charlie White and partner Sharna Burgess. Both pairs earned 36 points for their cha cha routines.