Jeremy Hunt faces renewed pressure after he failed to declare thousands of pounds of donations from media and arts companies which sponsored a series of networking events before the 2010 general election.

The culture secretary is to amend his entry in the House of Commons register of members' interests after what aides described as a "miscommunication" with his deputy, Ed Vaizey.

Hunt, who is fighting for his political life after the resignation of his special adviser Adam Smith, attended three networking events before the election. They were sponsored by the advertising agency DDB UK, which paid £1,473.81 in September 2009; the Groucho Club, which provided £1,435 in November 2009; and M&C Saatchi which stumped up £4,563.50 in July 2009.

The culture secretary will have to declare donations totalling £3,736.15 – half of the value of the three events. Vaizey will amend his entry to make a similar declaration for the three events. He has already declared a further four events, one of which was sponsored by BSkyB, which Hunt did not attend.

Hunt's office blamed the oversight on a misunderstanding with Vaizey who organised the events and who declared in his entry that he and his boss had attended the events.

A spokeswoman for Hunt said: "We are going to correct the register. Jeremy Hunt did not go to a majority of these events. He did not attend the BSkyB event but he did attend three of these events which he will declare. This was a miscommunication. Ed Vaizey made a declaration. Jeremy thought that covered the events which were organised by Ed."

Hunt is under pressure after emails published by the Leveson inquiry showed Smith appeared to have worked closely with Frédéric Michel, a News Corp lobbyist, during its bid to take full control of BSkyB.

David Cameron has said he will decide whether to refer Hunt to Sir Alex Allan, the independent adviser on the ministerial code, after Hunt gives evidence to the Leveson inquiry.