diff --git a/src/main/resources/xsl/pica2mods_dfi.xsl b/src/main/resources/xsl/pica2mods_dfi.xsl
index cc1efb9..fb46093 100644
--- a/src/main/resources/xsl/pica2mods_dfi.xsl
+++ b/src/main/resources/xsl/pica2mods_dfi.xsl
@@ -51,19 +51,19 @@
   <xsl:template name="modsDfiFIVSubject" >
     <xsl:for-each select="./p:datafield[@tag='045N'][not(@occurrence)]" >
       <mods:subject xlink:type="simple">
-        <xsl:variable name="valueURI" select="concat('http://bartoc.org/en/node/20447#',./p:subfield[@code='a'])"/>
+        <xsl:variable name="valueURI" select="concat('http://bartoc.org/en/node/20447#',translate(./p:subfield[@code='a'],' ',''))"/>
         <mods:geographic authorityURI="http://bartoc.org/en/node/20447" valueURI="{$valueURI}"/>
       </mods:subject>
     </xsl:for-each>
     <xsl:for-each select="./p:datafield[@tag='045N'][@occurrence='01']" >
       <mods:subject xlink:type="simple">
-        <xsl:variable name="valueURI" select="concat('http://bartoc.org/en/node/20446#',./p:subfield[@code='a'])"/>
+        <xsl:variable name="valueURI" select="concat('http://bartoc.org/en/node/20446#',translate(./p:subfield[@code='a'],' ',''))"/>
         <mods:topic authorityURI="http://bartoc.org/en/node/20446" valueURI="{$valueURI}"/>
       </mods:subject>
     </xsl:for-each>
     <xsl:for-each select="./p:datafield[@tag='045N'][@occurrence='02']" >
       <mods:subject xlink:type="simple">
-        <xsl:variable name="valueURI" select="concat('http://repo.dfi.de/api/v1/classifications/fivdfi#',./p:subfield[@code='a'])"/>
+        <xsl:variable name="valueURI" select="concat('http://repo.dfi.de/api/v1/classifications/fivdfi#',translate(./p:subfield[@code='a'],' ',''))"/>
         <mods:topic authorityURI="http://repo.dfi.de/api/v1/classifications/fivdfi" valueURI="{$valueURI}"/>
       </mods:subject>
     </xsl:for-each>