diff --git a/pdf/src/plugin-resources/fo-body.xslt b/pdf/src/plugin-resources/fo-body.xslt
index cd03cf2a..980dc0a7 100644
--- a/pdf/src/plugin-resources/fo-body.xslt
+++ b/pdf/src/plugin-resources/fo-body.xslt
@@ -357,7 +357,7 @@
     </xsl:template>
     <xsl:template match="a[@href and starts-with(@href, '#')]">
         <xsl:param name="chapterNumber"/>
-        <fo:basic-link internal-destination="{$chapterNumber}{@href}">
+        <fo:basic-link internal-destination="{$chapterNumber}{@href}{generate-id()}">
             <fo:inline xsl:use-attribute-sets="href">
                 <xsl:apply-templates>
                     <xsl:with-param name="chapterNumber">
@@ -381,7 +381,7 @@
     </xsl:template>
     <xsl:template match="a[@name]">
         <xsl:param name="chapterNumber"/>
-        <fo:block id="{$chapterNumber}#{@name}">
+        <fo:block id="{$chapterNumber}#{@name}{generate-id()}">
             <xsl:apply-templates>
                 <xsl:with-param name="chapterNumber">
                     <xsl:value-of select="$chapterNumber"/>