The consultation period for the Big Lottery Fund policy framework contravenes the Compact, according to the NCVO.
The umbrella body says the nine weeks allotted by the Department for Culture, Media and Sport falls short of the 12-week period stipulated in the agreement. The Compact states that "allowance should be made for holiday periods", but half of the consultation falls in August.
"It is disappointing that it does not meet agreed timescales to ensure maximum participation," said Campbell Robb, director of public policy at the NCVO.
But Anthony Wright, a spokesman for the DCMS, insisted that the Compact had been followed. "It says 12 weeks should be allowed for reply, but where this is not possible, eight weeks will be the minimum," he said.