Eucalyptus oil photosensitizing?

Hi,
Could anybody tell me whether eucalyptus oil is photosensitizing? I heard that it was but the thing is it is in my suncsreen. There is about 1 drop in the 8oz bottle (though it really does smell distinctly eucalyptusy not sure if 1 drop is supposed to have that effect). Do you think this would cause photosensitivity in the skin? If it did it would contradict the purpose of the sunscreen in the first place and I don't want to use it anymore.
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