National union leaders are urging workers at the Northrop Grumman Corp. shipyard in Pascagoula, Miss. to end a month-long walkout by approving Northrop’s latest contract proposal, which will be voted on Wednesday.

Under the proposal, workers at Northrop’s Ingalls shipyard which is the state’s largest private employer — would get a raise of $2.78 an hour over the next three years which is $1.22 less than what workers originally sought, but 18 cents more than the company’s previous proposal, union officials said.

The month-long strike is the longest work stoppage at the plant in more than seven years, Northrop said. The Los Angeles-based contractor is the nation’s largest shipbuilder and gets 18 percent of its $30 billion annual revenue from shipbuilding.

“We believe this agreement addresses the entire range of concerns from the members and their families and we’re recommending a yes vote,” Ron Ault, national president of AFL-CIO’s Metal Trades Department, said in a statement Tuesday.

Workers went on strike March 8 after rejecting two previous offers from Northrop. Employees at two other Northrop shipyards in Gulfport, Avondale and in Tallulah, La. approved labor contracts earlier this year.

Shares in Los Angeles-based Northrop were down 20 cents to $75.49 in afternoon trading Wednesday on the New York Stock Exchange.