After lodging a protest with the Screen Writers Guild, Mankiewicz withdrew it, then vacillated. The question was resolved in January 1941 when the studio, RKO Pictures, awarded Mankiewicz credit. The guild credit form listed Welles first, Mankiewicz second. Welles's assistant Richard Wilson said that the person who circled Mankiewicz's name in pencil, then drew an arrow that put it in first place, was Welles. The official credit reads, "Screenplay by Herman J. Mankiewicz and Orson Welles". Mankiewicz's rancor toward Welles grew over the remaining 12 years of his life.