diff --git a/xsl/chunk-common.xsl b/xsl/chunk-common.xsl
index c8c4ce6..40a5820 100644
--- a/xsl/chunk-common.xsl
+++ b/xsl/chunk-common.xsl
@@ -28,7 +28,7 @@
     <xsl:choose>
         <xsl:when test="not($recursive)">
             <!-- translate dots into directory separators, and replace illegal file path characters with underscores -->
-            <xsl:value-of select="translate( $basename, '.&lt;&gt;\:*?&quot;|', '/_______' )"/>
+            <xsl:value-of select="translate(normalize-space(translate($basename, '._&lt;&gt;\:*?&quot;|', '/         ' )), ' ', '_')"/>
             <xsl:value-of select="$html.ext"/>
         </xsl:when>
         <xsl:otherwise>