diff --git a/xsl/xhtml5.xsl b/xsl/xhtml5.xsl
index 03b2669e3..2ed2e6aac 100644
--- a/xsl/xhtml5.xsl
+++ b/xsl/xhtml5.xsl
@@ -380,14 +380,15 @@
   </xsl:template>
 
   <xsl:template match="/page/portal/item">
-	<!-- 1 (not really) random character 1-9 and blank -->
-<!--
- deactivated until nix package has crypto support
--->
-	<xsl:variable name="diceroll">4</xsl:variable>
-<!--
-	<xsl:variable name="diceroll" select="translate(substring(crypto:sha1(.),1,1),'0abcdef','')"/>
--->
+	<!-- 1 (not really) random character 1-9 and blank
+		crypto:sha1 depends on crypto being built with xsltproc
+	 -->
+	<xsl:variable name="diceroll"><!--
+		--><xsl:choose><!--
+			--><xsl:when test="not(function-available('crypto:sha1'))">4</xsl:when><!--
+			--><xsl:otherwise><xsl:text select="translate(substring(crypto:sha1(.),1,1),'0abcdef','')"/></xsl:otherwise><!--
+		--></xsl:choose><!--
+	--></xsl:variable>
     <article>
       <xsl:if test="@class">
 	<xsl:attribute name="class"><xsl:value-of select="@class"/></xsl:attribute>