MATLAB: Yyaxis, control aspect ratio

aspect ratioyyaxis

Hi,
I'm trying to create a plot with 2 y-axis using yyaxis.
I would like to to set one of the two y-axis to have an aspect ratio of one in comparison with the x-axis.
I tried
set(gca,'DataAspectRatio',[1 1 1])
and
axis equal
but it throw the following error: "Warning: Only 'auto' DataAspectRatio is supported for axes with multiple coordinate systems."
Is there a way around this limitation?
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