By Lindsey Bahr
September 10, 2013 at 12:00 PM EDT

Principal photography on The Mortal Instruments: City of Ashes has been postponed indefinitely, Constantin Film announced Tuesday.

The adaptation of Cassandra Clare’s extremely successful YA series was set to begin production next week, but the first installment, The Mortal Instruments: City of Bones, has been a solid box office disappointment since it opened on August 21. It has taken in less than $30 million domestically, on a production budget of $60 million.

“Constantin Film has a long tradition of adapting books to the big screen. Pushing back the start of production of City of Ashes was a decision we did not take lightly,” producer and Constantin exec Martin Moszkowicz said in the press release announcing the delay. “After speaking with all of our partners on the creative and distribution side, it was clear that it will be beneficial to have more time to reposition the film in the current market place.”

He added: “While taking Cassandra Clare’s vision to the screen we want to make sure to draw on the full potential of the franchise.”

Stars Lily Collins and Jamie Campbell Bower were set to reprise their roles in the sequel that would be directed by City of Bones helmer Harald Zwart. Sigourney Weaver had also signed on to play the leader of the Shadowhunters.

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