A post accompanying a YouTube video of the performance says the 90-year-old Van Dyke and the other three members of his quartet, The Vantastix, had just finished an appearance on a local television show before going out for breakfast.
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The video shows the quartet seated with pancakes at the table and singing the theme song to the 1968 British musical, which starred Van Dyke.
VIDEO: Dick Van Dyke performs 'Mary Poppins' tune at Walt Disney's birthplace
Dick Van Dyke performs 'Mary Poppins' tune at Walt Disney's birthplace
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Van Dyke and The Vantastix are promoting a show later this month in southern California.
VIDEO: Flash mob performs 'Mary Poppins' medley for Dick Van Dyke's 90th birthday