xsl fo:block rendering issue

I have 2 fo:block elements inside my table cell and I
want those to render one after the other.

Example:
<fo:table-cell>
<fo:block>aaa</fo:block><fo:block>bbb</fo:block>
</fo:table-cell>

Desired output:
aaabbb

But the output I am seeing:
aaa
bbb

'bbb' goes to the next line. The table cell has enough
width to hold both side by side. So I am not sure
what's causing it to render 'bbb' in the next line.

Any help will be appreciated.

Thanks.
Mark

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