diff --git a/modules/bibliography.xml b/modules/bibliography.xml
index 752cc55..d06e1c0 100644
--- a/modules/bibliography.xml
+++ b/modules/bibliography.xml
@@ -70,9 +70,6 @@
 			<xsl:text>}</xsl:text>
 		</common>
 		<common formats="/html/xhtml/">
-			<xsl:variable name="id">
-				<xsl:value-of select="@label" />
-			</xsl:variable>
 			<xsl:text> [</xsl:text>
 			<xsl:apply-templates select="item" />
 			<xsl:text>]</xsl:text>