Britain's Merlin Entertainments said key summer trade had remained weak at its UK theme parks after a serious roller coaster crash at its Alton Towers resort in June.
The company is the world's second biggest visitor attractions operator and its attractions include Madame Tussauds, Sea Life Centres and London Eye.
It had already warned in July that lost theme park revenues would push group profit below forecasts to around the €249m posted in 2014.
The firm reiterated that expectation today.
"The trends we reported at the half year have continued throughout the summer," Merlin's chief executive Nick Varney said.
"While near term challenges remain, the group is making good overall progress on its growth strategy," referring to ambitious opening plans in Asia and North America.
Group like-for-like sales for the 36 weeks to September 5 were up 0.3%, slowing from the growth of 2.8% at the half year, as strong Legoland trade in North America and Germany just offset reduced business at Alton Towers and other UK parks.
A weak euro also hit visitor numbers at London attractions.
The company said that including new openings group revenue was up 3.8%.
Merlin said like-for-like sales at its theme parks unit fell 11.4%, as visitors stayed away following a rollercoaster crash in June that seriously injured four teenagers and led to two having leg amputations.
It was forced to temporarily close the park and it has shut down some rides. The firm said annual core earnings for the theme park business would now be in the lower part of a guided range of £40-50m and added weak trade could stretch into 2016.
