diff -ur docbook-xsl-1.73.2-orig/fo/param.xsl docbook-xsl-1.73.2/fo/param.xsl
--- docbook-xsl-1.73.2-orig/fo/param.xsl	2007-12-03 15:49:14.000000000 +0100
+++ docbook-xsl-1.73.2/fo/param.xsl	2007-12-04 15:49:46.000000000 +0100
@@ -23,8 +23,8 @@
   <xsl:attribute name="keep-with-next.within-column">always</xsl:attribute>
   <xsl:attribute name="keep-with-next.within-column">always</xsl:attribute>
   <xsl:attribute name="space-before.optimum"><xsl:value-of select="concat($body.font.master, 'pt')"/></xsl:attribute>
-  <xsl:attribute name="space-before.minimum"><xsl:value-of select="concat($body.font.master, 'pt * 0.8')"/></xsl:attribute>
-  <xsl:attribute name="space-before.maximum"><xsl:value-of select="concat($body.font.master, 'pt * 1.2')"/></xsl:attribute>
+  <xsl:attribute name="space-before.minimum"><xsl:value-of select="concat(($body.font.master * 0.8), 'pt')"/></xsl:attribute>
+  <xsl:attribute name="space-before.maximum"><xsl:value-of select="concat(($body.font.master * 1.2), 'pt')"/></xsl:attribute>
   <xsl:attribute name="hyphenate">false</xsl:attribute>
   <xsl:attribute name="text-align">center</xsl:attribute>
 </xsl:attribute-set>
@@ -331,8 +331,8 @@
   <xsl:attribute name="font-weight">bold</xsl:attribute>
   <xsl:attribute name="keep-with-next.within-column">always</xsl:attribute>
   <xsl:attribute name="space-before.optimum"><xsl:value-of select="concat($body.font.master,'pt')"/></xsl:attribute>
-  <xsl:attribute name="space-before.minimum"><xsl:value-of select="concat($body.font.master,'pt * 0.8')"/></xsl:attribute>
-  <xsl:attribute name="space-before.maximum"><xsl:value-of select="concat($body.font.master,'pt * 1.2')"/></xsl:attribute>
+  <xsl:attribute name="space-before.minimum"><xsl:value-of select="concat(($body.font.master * 0.8),'pt')"/></xsl:attribute>
+  <xsl:attribute name="space-before.maximum"><xsl:value-of select="concat(($body.font.master * 1.2),'pt')"/></xsl:attribute>
   <xsl:attribute name="start-indent">0pt</xsl:attribute>
 </xsl:attribute-set>
 <xsl:attribute-set name="index.entry.properties">