Pope Francis canceled his audiences Monday because of a “slight flu-like state,” just days before he is to embark on a trip to Belgium and Luxembourg, AP reported citing the Vatican.

A statement from the Vatican described the clearing of Francis’ agenda for the day as a “precaution.”

Francis is due to visit Luxembourg on Thursday and then spend the rest of the week in Belgium, ending with a Mass in Brussels on Sunday.

The 87-year-old pope, who has been using a wheelchair for two years, has battled a series of health problems in recent years and had part of one lung removed as a young man because of a respiratory infection.

He has had a packed schedule of audiences since returning from a four-nation, 11-day journey through Asia on Sept. 13, which was the longest and farthest trip of his pontificate. The audiences have included multiple meetings with visiting bishops, individual audiences with his Vatican aides as well as a big encounter on Friday with members of popular movements.

The statement from the Holy See press office described Francis as having a “flu-like state.” Through much of last autumn and winter, Francis battled acute bronchitis and recurring bouts of influenza, which forced him to cancel a quick trip to Dubai in November to participate in the U.N. climate conference.