diff --git a/src/main/xslt/modules/functions.xsl b/src/main/xslt/modules/functions.xsl
index 629db0071..58f8bbcef 100644
--- a/src/main/xslt/modules/functions.xsl
+++ b/src/main/xslt/modules/functions.xsl
@@ -62,11 +62,12 @@
   <xsl:variable name="names"
                 select="distinct-values($attributes/node-name())"/>
   <xsl:for-each select="$names">
+    <xsl:variable name="namespace" select="namespace-uri-from-QName(.)"/>
     <xsl:variable name="name" select="."/>
     <xsl:variable name="values" as="xs:string*"
                   select="$attributes[node-name()=$name]/string()"/>
     <xsl:if test="exists($values)">
-      <xsl:attribute name="{$name}"
+      <xsl:attribute name="{$name}" namespace="{$namespace}"
                      select="string-join($values, ' ')"/>
     </xsl:if>
   </xsl:for-each>