diff --git a/format-master.xml b/format-master.xml
index 33dfe50..857b2e3 100755
--- a/format-master.xml
+++ b/format-master.xml
@@ -30,7 +30,7 @@
 				supplied.
 			-->
 			<xsl:variable name="add">
-				<xsl:value-of select="floor(number(@offset))" />
+				<xsl:value-of select="floor(@offset)" />
 				<xsl:if test="not(@offset)">0</xsl:if>
 			</xsl:variable>
 			<xsl:value-of select="$paper-year + $add" />