how to change label size boxplot?

Hi!

I'm having some troubles changing the labele size of a box plot. Here is my plot:

 bh=boxplot(rand(10,3), 'notch' ,  'on','widths',0.6, 'symbol','k+','labels',{'a','b','c'});

and here the error I get:

 set(findobj(gca,'Type','text'),'FontSize',13)
??? Subscript indices must either be real positive integers or logicals.

findobj(gca,'Type','text')

ans =

195.0187
194.0187
193.0187

Some suggestions how to change the size of the lables 'a','b','c'?

Thank you!