Moderna Inc said it is proposing filling vials with additional doses of the Covid-19 vaccine to ease a crunch in manufacturing as the company approaches the manufacturing of almost a million doses a day.

“The company is proposing filling vials with additional doses of vaccine, up to 15 doses versus the current 10 doses,” Moderna said in an emailed statement, according to Reuters.

“Moderna would need to have further discussions with the FDA to assure the agency’s comfort with this approach before implementing,” the company said, referring to the US Food and Drug Administration.

Moderna’s president, Stephen Hoge, said in the statement that the additional doses would help address capacity constraints, noting that “beyond the amount of drug product available, is how many vials you can fill in a given period of time”.