Whitespace between nodes

I have the following XSL fragment:

<q><xsl:value-of select="."/></q>

Some processors produce this:

<q>Quack</q>

While others produce this:

<q>
  Quack
</q>

The latter produces the wrong output in HTML, " Quack " instead of 
"Quack".
Is there a way to force a processor not to output space between nodes 
(I have indent="yes" in my xsl:output)?
- Nick.