diff --git a/resources/xproc/repertorium/oais-tei.xsl b/resources/xproc/repertorium/oais-tei.xsl
index 2adc08e780522bdf3a7c3f8b65818806ccbc2a3c..2f2ced4ab3db58316c2098f9da2d491c5eac90f0 100644
--- a/resources/xproc/repertorium/oais-tei.xsl
+++ b/resources/xproc/repertorium/oais-tei.xsl
@@ -28,4 +28,8 @@
     <xsl:value-of select="."/>
   </xsl:template>
 
+  <xsl:template match="@class[parent::msItem]">
+    <xsl:attribute name="class" select="concat('http://selbstzeugnisse.hab.de/repertorium/vokabular#', substring-after(., '#'))"/>
+  </xsl:template>
+
 </xsl:transform>