Zillow’s listing standards policy is slated to go into effect on Monday, but not if Compass gets its way with the court.

Real estate brokerage company Compass has filed a lawsuit against Zillow, claiming the popular real estate website is refusing to accept home listings for properties that have been initially advertised for sale elsewhere.

Zillow and mega-brokerage Compass are battling it out over where real estate agents can list homes for sale. Homebuyers are stuck in the middle.