diff --git a/modules/global-elements.xml b/modules/global-elements.xml
index 89bbb30..53244a8 100755
--- a/modules/global-elements.xml
+++ b/modules/global-elements.xml
@@ -64,11 +64,13 @@
 	-->
 	<template name="PaperYear" match="PaperYear">
 		<common>
-			<xsl:variable name="add">
-				<xsl:value-of select="floor(@offset)" />
-				<xsl:if test="not(@offset)">0</xsl:if>
+			<xsl:variable name="add" as="xs:integer">
+				<xsl:value-of select="if ( @offset ) then floor( @offset ) else 0" />
 			</xsl:variable>
-			<xsl:value-of select="$paper-year + $add" />
+			<!--
+				It appears that we need an explicit type cast for $paper-year to keep everyone happy?!?! Even if you declare $paper-year to be xs:integer, XML Exchanger Editor still thinks you can't add a string ($paper-year) to an integer ($add). Stupid.
+			-->
+			<xsl:value-of select="xs:integer( $paper-year ) + $add" />
 		</common>
 	</template>